Most children are interested in amazing things, and they wonder ______.
A. When can they see UFOs.
B. how can elephants walk on tiptoe
C. why do fish sleep with their eyes open
D. why there is no plant life without lightening
---You bought the car ten years ago?---Yes. ______ it’s old, it still runs well.
A. Because B. Since
C. Although D. But
---Relax. Don’t work today. Just ______. ---Thanks a lot.
A. deal with B. take it easy
C. turn off D. stay away from
I don’t think one country can solve the problem of pollution alone, _______?
A. do I B. may I
C. can it D. can’t it
--- Have you finished all your homework?
--- Of course. I ______ it before I went out to play football.
A. had finished B. have finished
C. finished D. was finishing
Shangri-la, a place of mystery and beauty, is indeed a heavenly world ______ people live in.
A. who B. which
C. when D. where
