用适当的介词填空，如不需填则画“／” 。 1.Will you have a c
题型：填空题
问题：
用适当的介词填空，如不需填则画“／” 。
1. Will you have a chemistry lesson _______ next term?
2. What do you usually do _______- weekends?
3. I have too much homework _______this weekend.
4. We are leaving ________ the 15th.
5. Christmas Day is _______ December.