If you _____ stop smoking , you can only expect to have a bad cough .

He was overlooked when they ________ choosing a new manager, which came as a complete surprise to him.

Both Class 3 and our class won’t be able tofinish the work unless they ___ each other.

Environment-friendly Olympics requires Beijing to improve its environment, _______ turning it into an ecology-friendly city

I ___ Japanese since 1977