If H2 burns in O2 we can get ________.

A. on B. at C. up D. to

A. begin B. beings C. is beginning D. will begin

A. speak B. talk C. say D. tell

A. if B. but C. or D. and

A. dressing of B. having　　　　C. wearing　　 D. putting on

A. to turn down B. turning down

C. turned down　　 　D. turn down

A. try it on B. try on it C. wear it on D. dress it on

A.I don't B.I won't C.I can't D.I haven'

A. So it was B. It was so C. So did it D. So it is

A. hundred B. hundreds of C. hundred of D. hundreds