To keep fit, you should take more______ . Don’t be always busy doing your ______.

Desipt the fact that there was a big ______ over the meeting, it seemed that a good many of the invited guests would still attend it.  

There is a(an) ______ that more graduates choose teaching as their permanent careers.

They received a number of _____ from customers about the lack of parking facilities.

_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．