题目内容

I learn ___ my cost that a broken leg can be very painful.

A. at
B. on
C. to
D. in

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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

Seventy percent_____illiterate in that area.

A. is
B. are
C. is to be
D. can have