用适当的介词或副词填空。
1. He cut the apple____halves.
2. They had a pleasant chat____coffee.
3. What time is it __your watch?
4. We can't go out____a result of the bad weather.
5.I don't agree with you____the price of the house.
6. The reason____his coming late is that he missed the bus.
7. His carelessness led____his failure.
8. Sorry,I didn't____understand you.
9. They were just in time____the bus.
10. We must concentrate our efforts____improving education.