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 . With no gravity to push against, astronauts’ bones and muscles ________become weak.

A．should

B．must

C．can

D．need

5 . Although the climate in our city is good, yet the temperature ________ fall to 14 centigrade below freezing point in winter.

A．should

B．shall

C．can

D．may

6 . ________ you make so much noise, Jimmy? Your little sister is still sleeping.

A．Can’t

B．Must

C．May

D．Won’t

7 . 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

8 . We ________ be seen by AI as a small inconvenience that is in the way of the solution to a bigger problem.

A．could

B．should

C．need

D．dare

9 . In the country Bhutan, weather ______ vary dramatically from place to place, day to day or even within the same day.

A．can

B．shall

C．must

D．need

10 . — Who ________ it be that left the door unlocked?
— It might be Mike. He is always forgetting things.

A．could

B．should

C．must

D．might