—Is your brother at home?
—No. He ________ the library. He hasn’t come back yet.
| A．was going to | B．has been to |
| C．has gone to | D．goes to |
We know that about seventy percent _____ the earth _____ covered by water.
| A．/; is | B．of; are |
| C．of; is | D．about; are |
you drive,you will be.
| A．More carefully; safer; | B．The more careful, the safer |
| C．The more carefully, the safer. | D．The more careful, the safer |
The policeman asked the child ________ cross the street ________ the traffic lights turned green.
| A．not, when | B．not to, until |
| C．didn't, before | D．not to, after |
— I have great _______in finishing the work by myself. Could you help me?
— No problem.
| A．fun | B．success |
| C．advice | D．difficulty |