Without ____ participation of so many people, the completion of such a project in a short period would be out of ______ question.

Though we found _____difficult to avoid economic and financial crisis, we must take measures to reduce its negative impact.

If you don’t resist smoking heavily like that , you will have to suffer the _______sooner or later .

We shouldn’t spent our money testing so many people, most of _____are healthy

——Hi, Steve, you look tired.——I am tired. I ______ the living room all the afternoon.