Jack ___ you more help, even though he was busy.
A. might have given
B. might give
C. may have given
D. may give
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I learn ___ my cost that a broken leg can be very painful.
A. at
B. on
C. to
D. in
It is rather cold again today, but tomorrow we expect the temperature to ___________.
A. lift
B. rise
C. grow
D. raise
This question is too difficult,and everyone is ____ to solve it.
A. at his wits'end
B. at one's wits end
C. in his wits'end
D. out of his wits end
The word 'fuzzy' ___ the fuzzy logic computer chip inside the oven.
A. refer to
B. is referring to
C. refered to
D. refers to