用适当的介词填空。

1. ___our great disappointment, he didn't attend such an important meeting.

2. The driver's carelessness led____the terrible car accident.

3.1 would stay at home instead____going out shopping. 

4. The boy ran to his mother as soon as he caught sight____her.

5. They have speeded____production of the new computer.

6. The photos reminded me____the happy days we spent together during the summer holiday.

7. What____earth do you want to say?

8. He was hit for lack____fresh air.

9. Now he can communicate____foreigners in English freely.

10. He felt unsettled______the first few days in the new company..