You’re coughing badly, Martin．Why not give up smoking?—- Give up smoking? Easier said than done, Amy．Once you _____ the habit of smoking, it is very hard for you to______．

. I don’t feel ____ this morning; I will goand have a lie-down.

It’s uncertain ________ the experiment is worth doing.

The students shouldn’t only be judged_____ how good their remarks were in the exam.in order to start their own business

____, are you Ben—No, I’m not. I’m Peter.