Put in am, can, can’t, couldn’t, have, had to, haven’t been able to, must, must be or must have:

Remember me?
There was a knock at the door. I opened it and saw a stranger. “Hello, Fred,” he cried. “… I come in?” “How do you know my name?” I asked. “We met ten years ago on a ferry-boat and you gave me your card.” “You … mistaken,” I said. “No, I … not” the stranger said. He produced my card” Fred Ames. I … given it to him ten years ago, but “I … remember you,” I said. “We exchanged cards years ago, “the stranger said. “You said, “You … come and stay with us as long as you like any time you’re in England.” “I’m sorry I … wait so many years before coming to visit you. I’ve been so busy, I …, but here I am at last! Better late than never! I’ve just arrived on the ferry. My wife and children are in the car and we wonder if we … stay with you for a month.”

Kazakhstan is a country that has always been famous for its hospitality and national oriental cuisine. Currently, the regional centers of the Republic of Kazakhstan are experiencing a real restaurant boom: the number of hotels, restaurants, cafes, bars, various clubs is growing rapidly. The catering industry is in the process of development.
  The restaurant market of Kazakhstan is divided into several segments: gourmet restaurants (gourmet dishes), affordable full-service restaurants (ordinary restaurants) - up to 80% of the market; fast-food enterprises (fast-food restaurants), representative offices of the network, as well as Turkish surrogates of world brands without copyrights and original names; dining rooms and cafeterias (fast casual). The society has developed a strong tradition of eating at home.
  in Kazakhstan, catering and food courts are well developed in shopping centers, the share of which reaches up to $ 70 million a year. This type is universally recognized as the most cost-effective among others, since in business there is a likelihood of obtaining greater returns in less time. This type is universally recognized as the most cost-effective among others, since in business there is a likelihood of obtaining greater returns in less time.
  The model of consumer behavior based on public catering began to expand only in recent years. If the average American spends up to 1,500 thousand dollars a year for restaurants, a German - about 500 dollars., a Russian - up to 100 dollars., then a resident of Kazakhstan - about 25 dollars.

1. I go school five times a week.

2. I visit my grandparents every Sunday .

или    I visit my grandparents just one time a week, on Sunday.

3. Three times a week I'm engaged in musical school.

4. One time a week my brother and I go for piknick at weekends.

5. I watch this serial several times a week.

6. I go dancing on a  discothek one time a week.

Объяснение:

1. Я хожу в школу пять раз в неделю.

2. Я навещаю своих бабушку и дедушку каждое воскресенье

.или:  Я навещаю своих бабушку и дедушку только один раз в неделю, в воскресенье.

3. Три раза в неделю я занимаюсь в музыкальной школе.

4. Один раз в неделю мы с братом ездим на пикник по выходным.

5. Я смотрю этот сериал несколько раз в неделю.

6. Я хожу танцевать на дискотеку один раз в неделю.