Unit 4 Wildlife Protection课时作业

Learning about language

Ⅰ.用所给词的适当形式填空

　　1．Most of the waste metal can______(put) to use again.

　　2．Electricity__________(discover) two thousand years ago.

　　3．This part of the seabed__________(explore) many times.

　　4．Much useful information about these planets__________(collect) since 1971.

　　5．Outer space__________(not explore) by people before 1957.

　　6．Much parking space in cities__________(save) by using small cars.

　　7．The first railway in the world__________(design) in the last century.

　　8．Computer science__________(teach) now almost in all universities and institutes.

　　9．Five units of this textbook__________(study) by the end of last month.

　　10．In this school English__________(teach) through TV.

　　答案

1．be put　2.was discovered　3.has been explored 4．has been collected　5.hadn't been explored 6．will be saved/has been saved/is saved 7．was designed　8.is being taught 9．had been studied