—Ben and Sue aren’t home, are they?
—No.They _____to London on business.
| A．have gone | B．go |
| C．have been | D．will go |
---Jim, can you finish your homework on time?
---______. I can finish it.
| A．It’s a piece of cake | B．It depends |
| C．Practice makes perfect | D．I’m afraid not |
We are sure to enter a better high school ________ we work hard.
| A．as soon as | B．as long as |
| C．as if | D．even if |
We must protect water from being _________, because it’s the source of life.
| A．polluted | B．provided |
| C．finished | D．punished |
My father ______ in China for 20 years already. He thinks his job is great.
| A．will work | B．works |
| C．has worked | D．is working |
______ good advice the teacher gave me!
| A．How | B．What | C．What a | D．How a |