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用所給動詞的正確時態和語態完成下面句子

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

用所給動詞的正確時態和語態完成下面句子

In this school English _______(teach)through TV．

用所給動詞的正確時態和語態完成下面句子

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

用所給動詞的正確時態和語態完成下面句子

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

用所給動詞的正確時態和語態完成下面句子

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