The time he has devoted in the past years ______ the disabled is now considered ______ of great value.
| A．to help; being | B．to helping; to be | C．to help; to be | D．helping; being |
—Catherine, I have cleaned the room for you.
—Thanks. You _________it. I could manage it myself.
| A．needn’t do | B．needn’t have done |
| C．mustn’t do | D．shouldn’t have done |
He paid for a seat, when he _________ have entered free.
| A．could | B．would | C．must | D．need |
—Do you know where David is? I couldn’t find him anywhere.
—Well. He _________have gone far—his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
Helen _________ go on the trip with us, but she isn’t quite sure yet.
| A．shall | B．must | C．may | D．can |
Mr. White _______ at 8:30 for the meeting, but he didn’t show up.
| A．should have arrived | B．should arrive |
| C．should have had arrived | D．should be arriving |