—How should we teenagers be ________ when crossing the road?
—We mustn't run the red traffic lights.
A. serious B. careful
C. pleased D. popular
Cindy，why are you so upset? Do you have any problems ____your homework?
A. at B. to C. above D. with
—Mrs. Wang was sent to teach English in a poor mountain village last year.
—She said she would never forget some pleasant ______while working there.
A. experiments B. expressions
C. experiences D. emotions
—What's the meaning of “secretary”？
—Let me ________ the word in the dictionary.
A. look at B. look for C. look after D. look up
（题文）You won't pass the exams ________ you work hard.
A. if B. unless C. so D. and
—How nice a fly!
—Thanks.I made it by ________．
A. me B. hers C. itself D. myself
