单项选择题
Wouldn't it be wise to（）the possibility of rain before planning the garden party?
A.check in B.check through C.check out D.check on
单项选择题 On hearing the bad news, she sprang up （）
单项选择题 At first, the speaker was referring to the problem of pollution inthe country, but halfway in her speech, she suddenly（）to another subject.
单项选择题 Your advice would be（）valuable to him, who is at present at his wits' end.
