At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.

Hi, I hear you’re going to London thissummervacation.—,I was going to, but now I have changed my plan.

land is two kilometers offthe coast, and you can’t get there ____ by boat.

What do you think of the proposal that improvement ____ in the type of vacuum cleaner

— There’ll be millions watching the game on TV tonight. — I know. The whole world _____. It’s a real global event. [ ]