I haven’t heard from Bill ________ he left here.
| A．when | B．before |
| C．since | D．while |
—Can you find our city _______ a lot in recent years?
—Yes. The road is wider and the buildings are taller.
| A．has changed | B．changes |
| C．changed | D．will change |
— A subway will be built in our hometown before 2017. — ________ ! Will it pass my house?
| A．What an excited news | B．What exciting news |
| C．How exciting news | D．How an excited news |
—What _______ the number of the students in your school?
—About two thousand. A number of them _______ from the countryside.
| A．is； are | B．is； is |
| C．are； is | D．are； are |
—I can hardly believe my eyes. Is that you, Lucy?
—Yes. It has been almost 20 years ______ we were together.
| A．since | B．before | C．after | D．Until |
—It’s smoggy these days. That’s terrible!
—Yes, I hope to plant trees. ______ trees, ______air pollution.
| A．The more; the fewer | B．the less; the more |
| C．The less; the fewer | D．The more; the less |