英语题目求高人解答谢谢！14. Their talks are expected to focus_____ arms

英语题目求高人解答谢谢！
14. Their talks are expected to focus_____ arms control.
A.on B.with C.over D.in

15.Your attitude, not your aptitude, will _____ your altitude.
A.underline B.imagine C.determine D.reward

16. Thanks _____ the English language，we can learn a lot from other countries．
A.for B.to C.of D.with

17. They will certainly need to _____ plenty of water.
A.take up B.take out C.take down D.take in

18.I tried to put ______ a telephone call to him, but his line was always busy.
A. overB. intoC. awayD. through
19. I hadn’t seen him for years, but I ______his voice on the phone.
A. realized B. recognizedC. discoveredD. heard
20. I ______ waste time when I was studying.
A. was used toB. used toC. will use toD. use to