用适当的介词填空。
1. The students are listening ___ their teacher very carefully.
2.——I'm looking forward ____ taking a holiday in Hainan.
——So am I.It's great to be ____ holiday there.
3. Sichuan is one of the largest provinces ____ China. It's ____ the southwest ____ China.
4.——It's necessary ____ you to take exercise ____ the morning.
——I agree ____ you. It's very kind ____ you to give me advice.
5. The moonlight comes in ____ the window and the room seems quiet and peaceful.
