根据句意及首字母或汉语提示,写出各句中所缺单词的正确形式。

1. There is no          (令人信服的) evidence that smoking causes lung cancer.

2. I hope you will always be            (充满精力的)when having classes.

3. She is an o       scientist , for she has made great contributions to her country.

4. Her mother never shouts at her in          (怒气)

5. He a         to the teacher for being later for class.

6. Every year a large number of            (商人) go to and from Yiwu.

7. Without the teacher's p         , you can't play with the computer in our classroom.

8. The company in NanJing e         about 20000 boxes of wine to the UK last year.

 9. She is s         to support a family on a very low income.

10. He was ill and          (因此)could not come.

除灰系统中泵与风机的选择原则是能使设备在系统中经济地运行。