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read the sentence pairs. choose which word or pharase best fits each blank.
memory/control system
1)the purpose of a computers is to store information.
2)a is a series of related parts that causes or prevents an action.
bus/operating system
1)the primary function of a(n) is to move data.
2)one might display information differently than another.
hardware/programming language
1)todays computers can translate an advanced into binary code
2)whater can damage a computers

I wanted  to visit you yesterday, but you wasnt  at home. (to want) (be, not)

Look! Sara (go) is going  to the movies.

The teacher (probably/assign) will probably assign a test to his students next Monday.

By 9 o'clock, we (finish) will have finish our homework.

I (drive) ve been driving for two months now.

It is already 9:30 PM and I (wait) ve been waiting here for over an hour. If John does not (get) get  here in the next five minutes, I am going to leave.

I (be) was  really angry at John yesterday. By the time he finally arrived, I (wait) had been waiting for over an hour. I almost left without him.

Did you (hear) hear that Ben was fired last month? He (work) had been working  for that import company for more than ten years and he (work) worked in almost every department. Nobody knew the company like he did.

Wait a minute, I will carry this box for you. (to carry)

I (see) had seen many pictures of the pyramids before I went to Egypt. Pictures of the monuments are very misleading. The pyramids are actually quite small.

Sarah (climb) climbed the Matterhorn, (sail) sailed around the world, and (go) went on safari in Kenya. She is such an adventurous person.

Look! It is going to rain, so we can't go to the beach. (to rain)

Sarah (climb) had climbed the Matterhorn, (sail) sailed around the world and (go) went on safari in Kenya by the time she turned twenty-five. She (experience) experienced more by that age than most people do in their entire lives.

(they / spend) Did they spend their holidays in Paris last summer?

When Melanie came into the office yesterday, her eyes (be) were red and watery. I think she (cry) cried

By the time we get to Chicago this evening, we (drive) had been driving more than four hundred miles. We are going to be exhausted.

At 6 o'clock on next Friday they (sing) will be singing  the new song.

When he (wake up) woke up yesterday , his mother (already /prepare) had already prepared breakfast

When Sarah goes on vacation next month, she (study) will have have been studying German for over two years. She should be able to communicate fairly well while she is in Austria.

(you / ever / see ) Have u even seen  a whale?

I have not traveled much yet; however, I (visit) Will have visit the Grand Canyon and San Francisco by the time I leave the United States.

I (finish) will have finish it by the end of this month.

By the time you finish studying the verb tense tutorial, you (master) will have master all twelve tenses including their passive forms.

I (just / finish) ve just finished my homework.

Drive faster! If you don't hurry up, she (have) will have had the baby by the time we get to the hospital.

Since 2011 they visit their son every year. (to visit)

I came to England six months ago. I started my economics course three months ago. When I return to Australia, I (study) will have been studying for nine months and I (be) be in England for exactly one year. (?)

At 8 o’clock, Andy (watch) was watching a video when I arrive tonight.

Margie just called and said she would be here at 8 o'clock. By the time she gets here, we (wait) had been waiting for her for two hours.

We were watching TV when it started to rain. (to watch)

Seals are very well adapted for accommodation in the cold seas. All their body, including, flippers and a short tail, is covered with the rough dense hair protecting an animal from ice water, snow, ice and the penetrating wind. Under skin all seals have quite thick grease layer.Seals near sea coast of moderate areas of the Northern hemisphere live. They never swim away far from coast and, sometimes, settle in the large rivers and fresh lakes. The area of their distribution lasts along coasts of Atlantic to border of polar ices and along the American and Far East coasts of the Pacific Ocean.These are, rather, small animals. With a length of a body of a male approximately in 1,5 m weight reaches 50 kg and changes within 50-150 kg seasonally. Female of approximately same sizes. Near the Pacific Ocean especially large race of seals lives. The head of them roundish, with a short neck, the muzzle which as if is a little chopped off eyes big, a trunk thickset. Color of coloring considerably varies from yellowish-gray with dark-brown spots to almost black with white spots of the wrong form. Teeth large, and canines are well developed. Nipples at females only one couple. On a face of a vibrissa with wavy edges.

Тюлени очень хорошо при к проживанию в холодных морях. Все их тело, в том числе, ласты и короткий хвост, покрыто грубым густым волосом, защищающим животное от ледяной воды, снега, льда и пронизывающего ветра. Под кожей у всех тюленей находится довольно толстый слой жира.Обитают тюлени вблизи морских берегов умеренных районов Северного полушария. Они никогда не заплывают далеко от берегов и, иногда, поселяются в крупных реках и пресных озерах. Ареал их распространения тянется вдоль побережий Атлантики до границы полярных льдов и вдоль Американского и Дальневосточного побережий Тихого океана.Это, сравнительно, мелкие животные. При длине тела самца примерно в 1,5 м. масса достигает 50 кг и изменяется в пределах 50-150 кг в зависимости от времени года. Самка примерно таких же размеров. В районе Тихого океана проживает особенно крупная раса тюленей. Голова у них округлая, с короткой шеей, морда как бы немного обрубленная, глаза большие, туловище коренастое. Цвет окраски значительно варьирует от желтовато-серого с темно-бурыми пятнами до почти черного с белыми пятнами неправильной формы. Зубы крупные, а клыки хорошо развиты. Сосков у самок только одна пара. На лице вибриссы с волнистыми краями.