15. Let’s go to the beach this weekend, ………… ?

A shall we B. do we C. don’t we D. will we

16. My father has gone away. He’ll be back ……… a week.

A. for B. at C. until D. in

1 7. We didn’t ...............to the station in time to catch the train.

A. get B. reach C. arrive D. approach

18. ................ you study harder, you won’t pass the examination.

A. If B. Although C. Despite D. Unless

19. He asked them …….. it again.

A. don’t do B. not do C. not to do D. didn’t do

20. Quite soon, the world is going to ...................... energy resources.

A. run out of B. get into C. keep up with D. come up again