1 . I wonder why we________ eat out all the time when we can cook our own meals at home.

A．may

B．would

C．should

D．must

2 . 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

3 . During the special period of fighting against the infective illness, you ________ wear a mask when going out.

A．must

B．can

C．need

D．may

4 . I advise you to stay away from Mary. Although she is usually easy-going, she ______be quite annoying sometimes.

A．can

B．need

C．must

D．should

5 . In order to make our dreams come true, we _______ work hard.

A．must

B．can

C．need

D．may

6 . —________ you leave now? You only arrived an hour ago!
—Sorry, but so much homework is waiting for me.

A．Must

B．May

C．Can

D．Might