May I take these books out of the reading room– No, you _________.

Not until the bus disappeared in the distance ________ her school bag was gone.

Premier Wen Jiabao said that if we worked hard and ________ optimistic, we were ________ win thewar against the swine flu.[ ]

Our government is trying its best to ____the social security system to protect people’s rights．

Our school proposes that students should involve themselves in community activities _____ they can gain experience for growth.