you will fail the exam ... you study hard.

a. when  b. if  c. if not  d. unless

that is the man ... car has just been stolen.

a. who  b. which  c. that  d. whose

the house needs ....

a. repaired  b. to repair  c. repairs  d. repairing

i prefer ... tv to reading books.

a. watch  b. watched  c. watching  d. to watch

john ... for me at the airport next sunday.

a. waited  b. wait  c. will wait  d. has waited