【黑龙江省哈尔滨市2015年中考英语试题】—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
--- We can use QQ to talk with each other on the Internet when you’re abroad.
--- Really? But can you tell me _______?
A. how I can use it B. how can I use it C. why can I use it