The World Health Organization has given some advice on        to protect us from being infected(感染) with H7N9.
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A
how
B
what
C
where
D
when
推荐题目
Tony’s sister is ______ to take care of the little baby. 
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A
careful enough
B
enough careful
C
enough carefully
D
carefully enough
I ______ to think my job was ______. But now I think it is interesting.
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A
used; bored
B
am used; boring
C
am used; bored
D
used; boring
Tom didn't get up _______, so he missed the early bus.
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A
enough early
B
enough late
C
late enough
D
early enough