A.must begin | B.may begin | C.should have begun | D.must have begun |
A.May | B.will | C.Should | D.Must |
A.may wait | B.ought to wait | C.could wait | D.must be waiting |
A.might | B.will | C.can | D.should |
A.can | B.need | C.might | D.should |
A.could | B.would | C.should | D.must |
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