----May I smoke here ?
-----If you , choose a seat in the smoking section .
A. should B. could C. may D. must
I like getting up very early in summer. The morning air is so good .
A. to be breathed B. to breathe C. breathing D. being breathed
-----She looks very happy. She have passed the exam.
------I guess so. It’s not difficult after all.
A. should B. could C. must D. might
----Did Peter fix the computer himself?
-----He , because he does know much about computers.
A. has it fixed B. had fixed it C. had it fixed D. fixed it
. your rotten idea, we went the long way .
A. Thanks to B. Due to C. Owing to D. Because
year after year , tigers are becoming fewer and fewer .
A. Having been killed B. Killing C. Killed D. Having killed
