There are many tall trees on ______ side of the street.
The official said they__________ a new law to protect the tourists the next year.
The schoolboy _________to the blind man on his Way home yesterday afternoon.
Look,so many passengers__________ with their smart phones on the underground.
I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
Which do you prefer to use to keep in touch with your friends,QQ__________MSN?