一、根据句意并结合汉语或首字母提示填写单词
1. There seemed to be no （动机，原因）for the murder.
2. The (起源) of the word remains obscure.
3. (令人难以置信) , she had no idea what was going on.
4. The program can show us word (出现率).
5. You will need to (计算) how much time the assignment will take.
6. My (助理) will demonstrate the machine in action.
7. I have heard (讲述，叙述) of people seeing ghosts in that house.
8. The country needs (投资；投入) in education.
9. The (火箭) was launched in March.
10. There is a (来往于两地之间的航班或班车) service between London and Edinburgh.
11. If you smell something unusual, take the car to your (机械师，技工) .
12. Now a special TV network gives live (报道) of most races.
13. Should spending on the arts be met out of the public p ?
14. Their cultural backgrounds gave them a spirit of a .
15. These meetings are a complete w of time.
