It is our duty ______much attention to ________ our best to keep our city clean.
| A．to pay, trying | B．paying, trying |
| C．pay, try | D．to pay, try |
- on the desk？
-Yes, it is.
A. What's B. Where is C. Is Bill's bag
These are our books. Please look after_________.
A. their B. they C. them
It's time listen the music.
A. to; / B. for; to C. to ; to
Who do you write to?
A．want B．want to C．to
Excuse me, how can I the History Museum?
A. get to B.gets to C.to get