Parents often ask their kids __ their internet friends because the kids may be in danger. A. to meet B. not to meet C. meeting
---Excuse me. Where is your teachers’ office?---________, sir.---Thanks a lot.
Simon likes playing ____ football but Sandy likes playing _____ piano.
________ is fun. I like ________.
It’s 9:00 now. It is time for us _____ sports.
--- Excuse me, what is on the wall of the classroom?--- Oh, ______ a blackboard , two doors and five windows.