下列计算中，正确的是（　　）

A．2Fe₂O₃的相对分子质量是：2×56×2×16×3=10752

B．H₂O中的氢元素和氧元素的质量比为2：1

C．CO（NH₂）₂中氮元素的质量分数的计算式为：

D．22gCO₂中碳元素的质量为：22g×

动词填空（本大题共10分，每小题1分）

A year ______________ (divide) into 52 weeks.

The maths problem is not easy enough for each of us ______________ (work) out.

When I got to the station, my friends ___________ (wait) for me.

It’s silly of you ___________ (not forgive) others for their mistakes.

Most boy school students have their hair __________(cut) once a month.

I would rather sell the old house _____(buy) a new one.

You should be confident enough _________ (take) this job. You’re the most suitable person.

The pupils are having fun      __  (make)cassettes..

Some day the scientist ____________ (clone) every living thing.

10. They_________(treat) well when they became sick.