Only 16 percent of China’s area ____ covered with forests, so ___

Only 16 percent of China’s area ____ covered with forests, so ____of us should protect trees.

#43863

are; every

is; each

is; everyone

are; each

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We live day by day，but in the great things the time of days and weeks ____ so small that a day is unimportant.

#86203

are

has been

havebeen

Nobody in our class but Tom and I ___ that our monitor is going abroad for further education.

#85709

know

am to know

have known

knows

I wonder whether the teacher is one of those who _______ to the mountain village to help the children there.

#85644

have sent

has sent

has been sent

have been sent

Every possible means ______ to prevent the air pollution, but the sky is still not clear.

#86302

is used

are used

has been used

have been used

 Mary is one of the girls who _____ often late for school.

#86190

come

are

comes

get

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