He looks upset. He doesn’t know ________.
| A．what to do it | B．how to do it |
| C．how to do | D．do what |
The schoolboy _________to the blind man on his Way home yesterday afternoon．
| A．apologizes | B．apologized | C．will apologize | D．has apologized |
Look，so many passengers__________ with their smart phones on the underground．
| A．played | B．will play | C．are playing | D．have played |
I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
| A．because | B．though | C．until | D．unless |
Which do you prefer to use to keep in touch with your friends，QQ__________MSN?
| A．and | B．but | C．or | D．so |
The volunteer spoke as__________ as she could to make the visitors understand her．
| A．clearly | B．more clearly | C．most clearly | D．the most clearly |