单项选择题

(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.

A. If
B. provide us
C. experience
D. improving
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(However) (it is) you have heard, (you'd better) ask him about it (in) person.
A. However
B. it is
C. you'd better
D. in
单项选择题
Mary was (surprised to) realize that it was (us), her old (school friends), (calling) her from Paris.
A. surprised to
B. us
C. school friends
D. calling
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