1、The computer of this kind can work ______ than the one of that kind.

2、When I was young， my grandmother told me that the earth ______ round.

3、—Do you know Jack well?

—Certainly. We ______ friends since ten years ago.

4、These hamburgers ______ nice， so they have all ______ out.

5、We now have ______ fast ways of traveling that this big ocean seems to have grown smaller.

6、I do not wish to ______ your sincerity.

7、The smog is due ______ invisible gases， mostly from automobile exhaust.

8、______ is accepted as true is relatively， and not absolutely， true.

9、How can you keep the machine ______ when you‘re away?

10、Because of his degree， he refused to do ______ he thought “low” work.