We are all very grateful __________ you for your help.
A. on
B. from
C. with
D. to
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Mary is the only student in my class __________ speaks Chinese
A. who
B. which
C. where
D. what
The key __________ success is hard work and persistence
A. on
B. to
C. for
D. of
If Jack __________ to the office tomorrow, give him the letter please
A. come
B. comes
C. came
D. will come
__________ Yellow River is known to be second longest fiver in China
A. The; the
B. /;/
C. The;/
D. /; the