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Объяснение:

a.

1. weather is forecast more accurately nowadays.

2. animals should be taken care of by children.

3. nuclear weapons must not be tested by countries.

4. water in the rivers mustn't be poisoned by factories and plants.

5. human environment should be kept clean.

6. waste should not be dumped into lakes, rivers and seas.

7. dangerous diseases should be cured by doctors.

8. endangered animals and plants ought to be saved by us.

9. climate shouldn't be influences so much by man.

b.

1. pictures are always taken by them on holidays.

2. are letters written often nowadays?

3. what are salads usually made of?

4. a rainstorm is expected by the weathermen for tomorrow.

5. flowers are generally grown by people in front of their houses.

6. wonderful fairy tales are usually told by grannies.

7. st. petersburg was found by peter the great in 1703.

8. what language is spoken in india?

9. the palace was destroyed by the fire.

10. our meeting won't be forgotten by you, it will be remembered.