This chemical class is about the ______ of metals with oxygen and our teacher shows us how iron ______ air and water.
A. react; reacts with B. react; reacts to
C. reaction; reacts to D. reaction; reacts with
After his journey from abroad, Richard Jones returned home, ______ .
A. energetic B. confirmed
C. exhausted D. independent
I was still sleeping when the fire ________, and then it spread quickly.
A. broke out B. put out
C. came out D. got out
During the long summer holidays, it is a _______ for American children to spend several weeks at summer camps.
A. costume B. custom C. customer D.feast
He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
—Lucy doesn’t mind lending you her dictionary.
—She______.I have already borrowed one.
A.can’t B.mustn’t C.needn’t D.shouldn’t
