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

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

The streets _______(light)by electricity．

用所给动词的正确时态和语态完成下面句子

When the traveler reached the railway station the train _______(leave)already．