实力测验――162页
一、
1.needn't
2.must
3.can't
4.do
5.Need, must
6.Would
7.have to
8.May / Can; may /can
9.Shall
二、
1.have to
2.is able to
3.must
4.was, able
5.ought to
三、
1.C 2.C 3.B 4.D 5.D