_____the teachers in their school is about 200 and one fourth of them are _____ teachers.

The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___1__ earlier, although the great inventor Leonardo Da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced___2___ long after he died.

　　A person riding a bicycle uses ___3___ energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed ____4___, most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel___5____ if they ride to work. It’s because __6___ cars on the roads becomes larger. It certainly becomes ___7___ to ride a bicycle. As a result, more people put their bicycles away and go to work ___8___ their cars cars, and in this way, the situation is made more serious.___9___ the best way to make riding safer and more popular is to create paths (开设通道) only for bicycles, and to make ___10___ so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles.

----What is _______ the people in the village ?

----I am sorry. I don’t know. I only know that _________people like living in village.

—_________students took part in planting trees on March .12 this year.

— Yes. It is said that ________ the students is 300.

A．The number of ; a number of              B．A number of; the number of

C．The number of; the number of             D．A number of; a number of

----Have you heard of the school bus accident recently?

-----Yes.          the victims was over 20 and most of them died.

A．A number                             B．A number of

C．The number of                         D．The number