用所给动词的正确时态和语态完成下列句子

The streets ________ (light) by electricity.

用所给动词的正确时态和语态完成下列句子

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列句子

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

用所给动词的正确时态和语态完成下列句子

Much useful information about these planets ________ (collect) since 1971.

用所给动词的正确时态和语态完成下列句子

This part of the seabed ________ (explore) many times.

用所给动词的正确时态和语态完成下列句子

Some rocks in the sea may ________ (see) in the daytime.

用所给动词的正确时态和语态完成下列句子

Most of the waste metal can ________ (put) to use again.

用所给词的正确形式填空

At the end of the meeting, it ________ (announce) that they had reached an agreement.

用动词的适当形式完成句子

There are five pairs of shoes ________ (choose) from, but I’m at a loss which to buy.

用动词的适当形式完成句子

Having a trip abroad is certainly good for the old couple, but it remains ________ (see) whether they will enjoy it.