11.Since you need the book badly,you might as well ______ a copy though it is expensive.

A.buy B.to buy

C.buying D.bought

12.Don’t tell Lao Lin about it,______?

A.will you B.won’t you

C.can you D.can’t you

13.He claimed ______ that mountain alone.

A.climbing B.to have climbed

C.to climb D.climbed

14.We’d better hurry ______ it’s getting dark.

A.and B.but

C.unless D.as

15.There is something wrong with my computer.I’ll have it ______.

A.repaired B.repair

C.repairing D.repairs