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— Tom’s never done extra work for his class, _______he?

—_______. He is the laziest boy in his class.

A．has; Yes           B．is; No             C．is; Yes            D．has; No

Look! What a clean room! Who _______it ?

A．has cleaned                           B．is cleaning

C．will clean                              D．cleaned

—Oh, this is really an old building.

—Do you know when it        ?

A．has built          B．is built            C．was built          D．will be built

完形填空

It seems that the cities in the future will have to change. Because the world’s population

1 , there will be  2  people in the cities tomorrow.

It may be    3   for any family to live in a house with land around it. There   4  enough space for them. 5   to solve this problem may be the skyscraper city(摩天城). The highest building in the world today is in Taipei. It’s about 509 metres high. The skyscraper cities in the future will be many times 6  .

In a skyscraper city about 250,000 people will live. Nearly a million people can 7  in four of these great buildings. Each skyscraper city will have four towns in it and each town will have ten villages. They will live, work and 8   their free time in them. They won’t need to leave the city 9  they want to. They will be able to move about in the city by transport controlled 10  computers. Let’s imagine how the life will be then!

The population of the world ____ still ____ now.

A．has; grown        B．is; growing         C．will; grow          D．is; grown