—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
He is late, ___ his bicycle is broken.
If your father ___ in a hurry, he will be late.
When you get on a bus, the conductor will usually warn you ___ a thief.
It’s easy ___ because the bicycle needs ___ space.
If people obey the rules, there will be ___ traffic jams and accidents.