用所给动词的正确时态和语态完成下面句子

Five units of this textbook _______(study)by the end of last month．

用所给动词的正确时态和语态完成下面句子

In this school English _______(teach)through TV．

用所给动词的正确时态和语态完成下面句子

These machines _______(show)at the exhibition last year．

用所给动词的正确时态和语态完成下面句子

Electricity _______(discover)two thousand years ago．

用所给动词的正确时态和语态完成下面句子

In most parts of the world human problems _______(study)at that time．

用所给动词的正确时态和语态完成下面句子

A new kind of space suit _______(make)last December in our factory．

用所给动词的正确时态和语态完成下面句子

Computer science _______(teach)now almost in all universities and institutes．

用所给动词的正确时态和语态完成下面句子

The streets _______(light)by electricity．

用所给动词的正确时态和语态完成下面句子

Much parking space in cities _______(save)by using small cars．

用所给动词的正确时态和语态完成下面句子

Outer space _______(not explore)by people before 1957．