Some of the students are not sure ___ spelling the word, while others are not sure ___ the use of some grammatical rules.
#28757
A
of… about
B
about…to
C
of…to
D
for….of
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I don’t like Tom’s way of behavior, but ________ I admire( 钦佩) his great  knowledge.
#25959
A
in other words
B
on the other hand
C
for one thing
D
as a result
You’ll sound a lot more polite if you make a request _______ a question. 
#26261
A
in the form of
B
in reply to
C
in preparation for
D
in return for