Нужно правильно ответить и объяснить почему так, а не иначе, заранее благодарю:3

Variant 1
1. My mother is ____ economist:
a) - b) а с) an d)the
2. _________ to London?
a) Did you ever go
b) Have you ever gone
c) You wen
d) Have you ever been
3. What are you doing?
a) I write an e-mail to a friend
b) I writing an e-mail to a friend
c) I'm writing an e-mail to a friend
d) I writes an e-mail to a friend
4. Is Pamela good ____ any sports?
a) at b) in c) for d) to
5. I've never ____ gymnastics
a) gone b) been c) for d) done
6. ____some photos on the wall.
a) It is b) There is c) There are d) They are
7. The Great Pyramid _____ 4,500 years ago.
a) was build b) was built c) has been built d) built
8. Burj Dubai tower will soon be the world's ______ sky scrapper.
a) most tall b) most tallest c) taller d) tallest
9.Mike has lived in New York
three years
a) since b) for c) next d) when
10. We ______ in the garden when it suddenly started raining.
a) were working b) was working c) worked
d) were worked
11 l've been ______ England twice. a) In b) at c) to d) from
12. Who _______the main role in this film?
a) does play b) do plays c) does d) plays
13 Has Anna arrived ______?
a) already b) yet c) just a) ever
14. Where's Andrew? - He's ____ to the gym.
a) went b) been c) gone d) done
15. What _____ tonight?
a) do you b) do you do c) you doing d)are you doing
16. Judy is a medical student She _____ a dentist
a) Is going to be b) going to be c) will be d) will be going to be
17. If we ____ in time, we _____ fireworks.
a) will arrive.... will see
b)arrive ... see
c) will arrive... see
d) arrive... will see
18._____ I get to the internet cafe, I'll phone you.
a) when b) if c) while d) then
19. If she ____ foreign languages, she _____get a higher salary.
a)knew....would
b) know... would get
c) would know ... got
d)knew... got
20. I ______ choose another cell phone if I ____ you.
a)will... were
b) would...were
c)had...was
d)would... be

1.c2.d.3.b или с,точно не знаю.4.d.5.d.6.c.7.c.8.a.9.d.10.a.11.a12.a.13.a14.c.15.d.16.b.

1.с) Слово начинается на гласную, поэтому артикль an.2.d) Здесь идет Present Perfect, в этом времени используется выражение been to.3) c) Present Continous требует вспомогательного глагола to be в формах am, is, are.4) b)  Выражение.5) d) Выражение.6) c) Используется множественное число, без основного глагола.7) b) Past Passive требует вспомогательного глагола и основного глагола в 3-ей форме.8) d) Короткое прилагательное в превосходной степени.9) b) В течении  трех лет.10) a) Past Continous.11) с) Выражение.12)d) Who- 3 13) b) Present Perfect.14) b)Выражение.15)d) Present Continous.16)c) Future17)d) if+Present Simple+will...18)b)19)a) if+Past Simple+would...20)b)