1. The computer, which is a very useful tool, is more and more dispensable in both our work and our life.

　　2. Comparing with the same type of products of other companies, your product is the best.

　　3. Nowadays surfing on the net is become a necessary part of our everyday life.

　　4. I wish I could speak English as fluent as native speakers do.

　　5. “I’ve got used to do E-commerce on the net,” he said to me proudly.

　　6. Surely it was them who left the package last night.

　　7. Our age, as we all know, is a information age.

　　8. The contract, which stipulations have been negotiated over the past six months, is to be signed again.

　　9. This letter is accompanied by a questionnaire and a self-addressed envelope .

　　10. Writing for Business Week, the TV networks were commended by the editor for their coverage of economics.

　　答： 1. dispensable →indispensable 2.Comparing →Compared 3. is become →is becoming/has become

　　4. fluent →fluently 5.do →doing 6.them →they 7.a →an 8.which →whose或which stipulations of which

　　9.by →with 10.the TV networks were commended by the editor →the editor commended in the TV networks