This room is used ______ a reading room.[ ]

How many god medals did Chinaat the 2010 Winter Olympics?—Five.

How long does it take?—Oh, it depends_____ the means of’ transportation. [ ]

The way we learn English is quite different ____ that we learn maths. [ ]

I need something for cutting the paper.－ Oh, you want a knife? OK, I’ll get ______ for you.