【推荐1】_________ you can’t answer the question, perhaps we’d better ask someone else.

【推荐3】单句语法填空
1. I have heard a lot of good things about you ______ I came back from abroad.
2. He smiled politely ______ Mary apologized to him for her drunken friends’ rudeness.
3. If you don’t understand something, you may research, study, and talk to other people ______ you figure it out.
4. Silk ______ （become）one of the primary goods traded along the Silk Road by about 100 BC.
5. The first time I ______ （meet）her, she was waiting for a bus.
6. She was studying at the University of Rochester when a professor ______ （suggest）a research subject to her.
7. They have regularly sent newspapers, but they rarely read them ______ they have so much work to deal with.
8. Was it ______ Jack came late for school that Mr.Smith got angry?
9. Now that the kids ______ （leave）home, we get more room.
10. ______ everything is prepared, let’s begin our experiment right now.

【推荐1】________ that you are familiar with the author’s ideas, try reading all the sections as quickly as possible.

【推荐2】Now ________you’ve finished the work, you ought to have a good rest.(用适当的词填空)

【推荐3】Now _____ you’ve got a chance, you might as well make full use of it.