It is said that bad living habits as well as dirty surroundings, stuffy rooms and some other factors _____ the wide spread of H1N1.[ ]

times didyou do exercise last week — Twice.

－I wantto be a computer manager.－________.I am studying computer science very hard.

Hello, may I speak to Mrs Zhou —________

Frank was born _____________ a cold winter morning ____________ 2006.