Forty minutes is enough for the work.
Twenty pounds is too expensive.
Thirty kilos of water are used every day.
Only 20%of the work was done.
About 20%of the students are absent.
Two thirds of the books are worth reading.
There is a kind of roses in the garden.
There are many kinds of apples.
Three million tons of coal were exported last year.
Two piece of cake were divided among the children.
10.the number of+名词复数，是表示“......的数量”，作主语时，谓语动词用单数形式。
The number of the students in our school is increasing year after year.
A number of students have gone for an outing.
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