1 . People liked O. Henry’s stories, because simple as the tales were, they ______ finish with a sudden change at the end, to the readers’ surprise.

A．could

B．would

C．might

D．must

2 . Waking up suddenly________lead to rapid heart rate and high blood pressure.

A．must

B．would

C．can

D．shall

3 . I asked in the bookshop about Will Dutton’s latest book, but all they           tell me was that it would come out before the end of the year.

A．might

B．must

C．could

D．should

4 . As a smoker, you ________ remember that the damage passive smoking does to people’s health and people’s lives is also very serious.

A．can

B．would

C．must

D．might