Choose the most suitable answer A, B, C, or D to complete the following passage

Part V- Choose the most suitable answer A, B, C, or D to complete the following
passage.
Air pollution is caused ___(1) ill health in human beings. In a lot of countries,
there are ___(2) limiting the amount of smoke factories can produce although there
is not enough __(3) on the effects of smoke on the atmosphere. Doctors have
___(4) that air pollution causes ___ (5) diseases. The gases from the exhausts
of cars __(6) also increased air pollution in most cities. The ___ (7) of petrol
produces a poisonous gas, which is often collected in busy streets circled by high buildings.
Children __(8) in areas where there is a lot of lead in the atmosphere can not think
as ___(9) as other children, and are clumsy when they __(10) their hands.
1. A. from B. on C. over D. of
2. A. laws B. ideas C. problems D. regulations
3. A. news B. article C. information D. newspaper
4. A. agreed B. pointed C. disagreed D. proved
5. A. lung B. heart C. liver D. stomach
6. A. had B. have C. has D. having
7. A. water B. lead C. gas D. exhaust
8. A. lived B. live C. to live D. living
9. A. quick B. slowly C. quickly D. slow
10. A. touch B. use C. handle D. collect