II 单项填空(共15小题；每小题1分，满分15分)
21. From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
A. why B. how C. because D. whether
22. ________ in a heavy rain, my daughter fell ill and couldn’t but______ for a leave.
A. Caught; to ask B. Being caught; to ask
C. Catching; ask D. Caught; ask
23. It’s much easier to make friends you have similar interests.
A. unless B. when C. even though D. so that
24. I’m calling about the apartment you the other day. Could you tell me more about it?
A. advertised B. had advertised C. are advertising D. will advertise
25. ----This is your order, a hamburger and an apple pie. ?
---- I’ll have it here.
A. Anything else B. Is that OK
