6设有直线当直线l1与l2平行时,λ等于( ).

10. It＇s no use ( ) your chickens before they are hatched.

9. She is looking forward as much to his return as he himself to ( ) her.

8. It＇s no use ( ) to get a bargain these days.

7. "Is George really leaving the university?"“Yes. But would you mind ( ) to anyone?"

6. Do you remember ( ) to Professor Smith during your last visit?

5. "Why is Fred so upset?""He isn＇t used ( ) criticized."

4. I like Jean but I don＇t like ( ).

3. Mr. Brown often wears a heavy coat because he is not used ( ) in such a cold climate.

2. She ( ) eat so many sweet things.

1. He used to ( ) the first to arrive and the last to leave.