His father told me that he ____ for the United States three days _______.
| A．has left; ago | B．had left; ago | C．left; ago | D．had left; before |
—It’s not wise of you to go on a trip in such weather.
—Indeed! I didn’t became _____of it until on half the way.
| A．awake | B．sense | C．aware | D．knowing |
— How much shall I pay for the phone cell?
— You _______. It’s free of charge.
| A．shouldn’t | B．can’t | C．don’t have to | D．mustn’t |
Life is limited, _____there is no limit to_____ the people.
| A．and; serve | B．but; serving | C．so; be served | D．besides; having served |
We all write _______ , even when there is not much to say.
| A．now and then | B．by and by | C．step by step | D．more or less |
It is believed _______ he has gone to Shanghai. The problem is ________ we can’t get in touch with him.
| A．when; that | B．that; that | C．that; whether | D．不填；不填 |