—Our class will have a party the evening of June 30th. Would you like to come?—Yes, I'd love to, but I'm going to visit my grandparents in Dalian.A. in B. on C. at
---______ shells do you have? ---Over 100 so far.
---______ did you first skate? ---Two years ago.
We are going to have a party ______ money for the poor people.
Sorry, Jim. I don’t have ______ time ______ with you. --- That’s all right.
---______ have you been in class today? ---For two hours.