1 . Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked.

A．must

B．should

C．may

D．need

2 . —Is Robert coming by coach?
—He should, but he ___________ not. He likes driving his car.

A．may

B．could

C．need

D．must

3 . There is great chance that the patient suffering from cancer____ survive with medical advances.

A．must

B．need

C．might

D．should