Here are the most suitable answers for each blank in the passage:

1. **A. from** (Air pollution is caused from ill health in human beings.)
2. **A. laws** (There are laws limiting the amount of smoke factories can produce.)
3. **B. article** (Although there is not enough article on the effects of smoke.)
4. **A. agreed** (Doctors have agreed that air pollution causes diseases.)
5. **A. lung** (Air pollution causes lung diseases.)
6. **B. have** (The gases from the exhausts of cars have also increased air pollution.)
7. **A. lead** (The petrol produces a poisonous gas which often leads to problems.)
8. **D. of** (In areas of high pollution, children...)
9. **B. slowly** (Children act slowly in polluted areas.)
10. **C. handle** (And are clumsy when they handle their hands.)

So, the completed passage using the selected answers is:

Air pollution is caused **(1) from** ill health in human beings. In a lot of countries, there are **(2) laws** limiting the amount of smoke factories can produce although there is not enough **(3) article** on the effects of smoke on the atmosphere. Doctors have **(4) agreed** that air pollution causes **(5) lung** diseases. The gases from the exhausts of cars **(6) have** also increased air pollution in most cities. The **(7) lead** of petrol produces a poisonous gas, which is often collected in busy streets circled by high buildings. Children **(8) of** areas where there is a lot of lead in the atmosphere cannot think as **(9) slowly** as other children, and are clumsy when they **(10) handle** their hands.