Research shows that people feel unhappy and worried when they have nothing to do . _______, the happiest are those who are busy.
The doctor advised Vera strongly that she should take a holiday, but _______ didn’t help.
I was disappointed with the film . I had expected ______ to be much better.
Does ______ matter if he can’t finish the job on time?
I don’t think ____ possible to master a foreign language without much memory work.
Is ____ necessary to complete the design before National Day?