1. According to scientists, our mental abilities begin to ______ from the age of 27 after reaching the highest level at 22.
A. differ
B. shrink
C. fail
D. decline
2. You have made the same mistake again! Can’t you be______?
A. more careful a bit
B. careful a more bit
C. a bit more careful
D. a bit careful more
3. Having no money but ______ to know, he simply said he would go without dinner.
A. not wanting anyone
B. not to want anyone
C. wanted no one
D. to want no one
4. Examination compositions, together with most business letters and government reports, are the main situations ______ formal language is used.
A. in which
B. on which
C. of which
D. for which
5. —Tom, you are caught late again.—Oh, ______.
A. not at all
B. just my luck
C. never mind
D. that’s all right