用适当的介词填空。
1. I’m completely ______ sea with the new regulations.
2. Angkor Wat is a famous temple which dates ______ the eleventh century.
3. ______ your arrival, please report to the reception desk.
4. She appealed to the judge to have mercy ______ her husband.
5. She buried her face ______ her hands and began to sob.
6. Would you mind waiting? I’m tending ______ another customer at the moment.
7. It is thought that terrorists had a hand ______ the explosion.
8. ______ the average, people who don’t smoke are healthier than people who do.
9. Kids, will you stop arguing ______ each other?
10. They cared for their disabled son for 27 years, ______ great personal sacrifice.

Key:
1. at      2. from    3. Upon/On         4. on         5. in 
6. to     7. in          8. On        9. with        10. at