Điền giới từ: It is very cold here .... night

Điền giới từ:
1. It is very cold here .... night.
2. We can play tennis ... the summer.
3. We will leave .... eight o'clock ..... Monday morning.
4. George has worked here .... ten years now.
5. I am going to American .... the weekend.
6. The concert will be begin .... fifteen minutes.
7. You can walk there .... half an hour.
8. You can take the exam again ...... June.
 ( mn làm giúp mình vớii ạ )