---Do you know how long ________? ----I’m sorry I don’t know.
| A．he has come here |
| B．has he been married |
| C．Tom has bought the car |
| D．his uncle has been abroad |
Linda hasn’t finished her homework ______.
A. already B. just C. yet
The population now is much ______ than that 20 years ago.
A. large B. larger C. largest
Everyone ______ to pick up litter on the ground.
A. is supposed
B. supposes
C. are supposed
I think we ought not to spit anywhere ______.
A. in public
B. in need
C. in detail
It costs much money to ______ the garbage.
A. turn off
B. belong to
C. deal with