Something must be done to prevent factories sending out poisonous gases so as to keep the city _________.A polluting B. from polluting C. pollute D. from being polluted
Reality is not the way you wish things to be, nor the way they appear to be, _________ the way they actually are.
--- Today is Tom’s birthday. Let’s have a birthday party tonight, shall we? --- ____________.
Nowadays teachers feel they can’t help every student ________ suitable reading materials, so they encourage them __________ English on the Internet.
It all depends on _______ you can speak Spanish fluently.
They didn’t turn up at the meeting yesterday. Otherwise, they _________ the report.