_____we promise continuous increase in rural incomes _____improve the whole people's well-being．

A．Only if; we can     B．If only; can we      C．Only if; can we     D．Unless; we can

No worker and no engineer           who it is that is           for the explosion of the chemical factory.

A．know; to blame                         B．would know; blamed

C．know; to be blamed                     D．knows; to blame

If there hadn’t been so much smog in Beijing, we______________ the beautiful scenery across the Tiananmen Square.

A．enjoyed           B．would have enjoyed C．had enjoyed       D．would enjoy

Our special thanks go to thousands of volunteers, without ________tireless work, none of this would be possible．

A．whose            B．which            C．whom            D．that

The government officials met the workers and engineers working on the stadium, most _________ being migrant workers.

A．of them           B．of what           C．of whom          D．of which

It’s very funny that many people who lose weight gain it back after some time and end up back __________ they started.

A．when            B．after             C．since             D．where

I hope that my father will quit smoking because I want him to live   my grandpa does.

A．as a long and healthy life as                B．as long and healthy a life as

C．such long and healthy a life as              D．so long and healthy a life as

________ the past, leaving the sadness behind, _____ you’ll see the door of a new bright world open before you.

A．Forget; and        B．Forgetting; and     C．Forget; /          D．To forgetting; /

Making mistakes is a part of life. ________ matters is _________ you do afterwards.

A．It; what           B．All; what          C．What; what        D．That; what

We’d better _____ some sports because sports can give us a perfect build and protect us from getting illness easily.

A．make up          B．take up           C．pick up           D．build up