Many scientists believe that global warming , if        , will cause extreme climate changes this century .

A．not stopping	B．no stop	C．not stopped	D．without stop
C
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Patrick has never learned a foreign language,              . A．nor does he think he has to B．neither he thinks he has to C．he thinks he has not to ,either D．he doesn’t think he has to
—He is fluent in English because he once stayed in London。 —Really ?How long ____ there ? A．did he live B．has he lived C．had he lived D．does he live
Only in recent years ________ realized that ability training is more important than profession Training. A．people have B．people had C．were people D．have people
Probably no man had more effect on the daily lives of most people in the United States ________ Henry Ford, a pioneer in automobile production. A. as was                 B. than was           C. than did               D. as did
___ entered the classroom when the bell rang. A．We hardly had B．Hardly had we C．Hardly we had D．Had we hardly