He fell off the bike ________.
| A．while he rode | B．while he was riding |
| C．while he is riding | D．while on bike |
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 |
-How well she sings!
-Yes, she has a very sweet __________.
| A．voice | B．Sound |
| C．Noise | D．shout |
He found very difficultthe math problem.
| A．that；to solve | B．this；solving |
| C．it；to solve | D．it；solving |