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.
A.committed B.switched C.favored D.transmitted
单项选择题 Your advice would be（）valuable to him, who is at present at his wits' end.
单项选择题 She cut her hair short and tried to（）herself as a man.
单项选择题 He has never done this type of work before; I am not sure how he will fit（）with it.
