I didn't hear the phone. I （ ） asleep.
（A）must be
（B）must have been
（C）should be
（D）should have been
I didn't see her in the meeting - room this morning. She （ ） at the meeting.
（A）mustn't have spoken
（B）shouldn't have spoken
（C）needn't have spoken
（D）couldn't have spoken
Driving on freeway （ ） be very dangerous, so you （ ） never be too careful.
（A）must; ought to
（B）can; can
（C）must; can
（D）should; should
