The rubbish _____ is produced every day is becoming a serious problem in cities around the world.
| A．what | B．that | C．who | D．whose |
More and more trees were cut down. _____, many animals are dying out.
| A．In the end | B．So that | C．As a result | D．At last |
We should often keep _____ touch with each other, because we are good friends.
| A．on | B．to | C．in | D．up |
—Do you think a radio is useful in learning English?
—Sure. A radio can _____ listening English songs and reports.
| A．be used by | B．be used as |
| C．be used for | D．be used to |
—Do you know _____?
—Sorry, I don’t know.
| A．what’s the population of Japan |
| B．what the population of France is |
| C．how much of the population of Japan is |
| D．how many is the population of France |