Помогите, пожалуйста, кто хоть немного разбирается в английском!

10.The performance (to begin) at 7 o'clock and (to last) for 3 hours.
a)begun/lasted
b)had begun/lasted
c)began/lasted
11.Helen (to prefer) tea to coffee.
a)prefers
b)is preferring
c)prefer
12.He (to speak) to his boss last week.
a) speaks
b) had spoken
c) spoke
13. While my son …..for my call, somebody knocked at the door.
a) was waiting
b) waited
c) wait
14. He lives …Chicago.
a) to
b) in
c) at
15. Bye, see you …. Tuesday!
a) on
b) at
c) in
16. Barbara plays …the piano well.
a) in
b) –
c) by
17. Don’t phone Jim from 5 to 6, he (to have) English.
a) will be having
b) will have
c)will having
18. By the time I come, they (to go).
a) will go
b) will be going
c) will have gone