根据句意和中文注释，在答题卷相应的横线上，写出所给单词的正确形式。
When you are in a library, you should keep ____________ (安静的).
How many ___________ (零) are there in this number?
His uncle does well in ____________ (饲养) some cows and sheep on his farm.
Fog and haze weather (雾霾天气) brings traffic problems in China, so it is ____________
(危险的) to drive so fast.
He is always late for school. Today he is the ______________ (四十一) to come to our class.
B、根据句意，在答题卷相应的横线上，写出所给单词的适当形式。
A friend of ___________ (they) is coming to China tomorrow.
Giraffes are the tallest among the animals, so they can eat the ___________ (leaf) from trees.
If you take more exercise, you will feel ________ (well).
The green car is one of the ___________ (policeman) over there.
The computer in our classroom doesn’t work at all. Maybe, it is ____________ (break).