1. This week Soyuzexport has received an enquiry for these machines from Brown & Sons.
A) received B) receiving C) has received D) receive

2. A young Englishman stayed in New York with his friend and saw very many interesting places in and outside the city.
A) see B) saw C) sees D) has seen

3. One day Williams a telephone for his car.
A) buy B) have bought C) bought D) are bought

4. People usually reservations for flights in advance.
A) make B) has made C) making D) will make

5. Passengers come to the airport an hour before the take-off time.
A) can B) may C) must D) is to

6. The talks were difficult and they for many hours.
A) last B) lasts C) lasting D) lasted

7. This flat is than Ann’s flat.
A) large B) larger C) largest D) more large

8. Broadway is one of the streets of the world.
A) interesting B) interested C) more interesting D) most interesting

9. Some districts of the city are not so as the center.
A) more beautiful B) most beautiful C) beautiful D) much beautiful

Present continous  She is always interrupting me – Она постоянно меня перебивает.

My sister is having her hair cut at the moment – В данный момент моя сестра стрижется.

I'm watching a movie at the moment – В данный момент я смотрю фильм.

Mary is cooking stew and Tom is making a salad – Мария готовит рагу, а Том делает салат.

The children are pretending to brush their teeth – Дети делают вид, что чистят зубы.                                                                                               Present simple They usually play tennis every weekend — Они обычно играют в теннис каждые выходные.

She brings me coffee every morning — Она приносит мне кофе каждое утро.

It snows in winter — Зимой идет снег.

Объяснение:

1 I have been working with this article since January
2 I haven't seen you for ages. What have you been doing so far?
3 I have been trying to explain you my plan for an hour, but you aren't listening to me.
4 I have been helping doctor during 5 years, that's why I know this work very well
5 How long have you been learning English?
6 How much time does he skate every day?
7 He learned from the letter that she had been living in London for 5 years 
8 We had been skating for an hour when at last he came
9 Ann had been coughing during 2 months and a new medicine cured her during 1 week
10 I don't smoke. I haven't been smoking for a year
11 Have you been waiting for him for a long time? I hope, nothing wrong has happened with him
12 Yesterday, I had been waiting for him during two hours
13 He has been preparing for the exam since Monday, he is tired
14 His brother has been teaching in our school since 1995
15 It has been raining during two weeks 
16 Las summer he had been living here during two weeks
17 George has earned little money recently
18 What have you been doing for two months
19 She has never visited us this month
20 His clothes was dirty. He had been working in a garden since early morning