They really don’t know how _________ the difficult problem.
| A．to solve | B．solve |
| C．solves | D．solved |
We________two hours________sports on TV．
| A．spent；to watch |
| B．spent；watching |
| C．took；to watch |
| D．took；watching |
—Look!It’s raining heavily．________take a raincoat with you?
—Well，I’ll take one right now．
| A．Why not |
| B．Why don’t |
| C．Would you mind |
| D．Would you like |
You’d better take the map with you________you won’t get lost．
| A．as long as |
| B．as soon as |
| C．now that |
| D．so that |
You don’t have to worry about me．I’m old enough to________myself．
| A．look after |
| B．look for |
| C．look up |
| D．look at |
—Look!Some people are running the red lights．
—We should wait________others are breaking the rule．
| A．if |
| B．unless |
| C．although |
| D．because |