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Mary had to go to a meeting，so she left her children ___________ at home.

A．playing           B．played            C．to play            D．having played

The government has taken some measures to solve the shortage of electricity, but it may be some time ____________ the situation improves.

A．since             B．when             C．unless            D．before

Sun Yang, a young Chinese swimming talent, ___________several gold medals before 2012 London Olympics.

A．won             B．has won           C．had won          D．were to win

The DiaoYu Island have been part of China’s territory since ancient times, __________as important fishing grounds of Taiwan.

A．served           B．serving           C．to serve           D．having served

The U. S．declares it has the best medical technology in the world，but quite a lot of Americans have no __________to health care service．

A．devotion          B．entrance          C．a(chǎn)ccess            D．introduction

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．a(chǎn)fter             C．since             D．where

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

A．a(chǎn)s a long and healthy life as                B．a(chǎn)s 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

— Do you know Sam didn’t pass the swimming test this time?

—_____________ His coach said he was the best one in his team.

A．So what?          B．How come?        C．Not at all.          D．I don’t think so.