—We’ll visit the Summer Palace________there is a heavy rain tomorrow．
—OK！Boating on the lake must be great fun．
| A．unless |
| B．since |
| C．as soon as |
| D．if |
If we try our best, we can finish the work with _______people and ______money.
| A．more, more | B．fewer, less |
| C．less, less | D．fewer, fewer |
There _____________ more trees if we all take care of our environment.
| A．will have | B．are |
| C．will be | D．is going to |
I can see _________birds in the sky.
| A．a hundred of | B．hundred of |
| C．two hundreds | D．hundreds of |
— __________will you come back to our city?
—In a week.
| A．How soon | B．How long |
| C．How far | D．How often |
Peter some beautiful postcards for his friends yesterday.
| A．gave | B．ate | C．bought | D．sent |