1 . The young man ____________ be slow, but at least he doesn't make any mistakes.

A．may

B．can

C．must

D．should

2 . It’s possible that Paul was linked to the attempted murder; he _____ have had a hand in planning it.

A．must

B．might

C．should

D．would

3 . It       sound like a perfect destination,but it is really adventurous to go there.

A．must

B．should

C．can

D．may