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Ответ:

1. was built

2. are being planted

3. was being chased

4. hasn't been cleaned by them

5. had been eaten

6. must be finished

7. was sent

8. should be informed

Объяснение:

2 Trees are being planted in the garden.

3 The cat was being chased by the dog around the house.

4 The floor hasn't been cleaned yet.

5 All the food had been eaten by the time I got there.

6 The project must be finished by Wednesday afternoon.

7 A wedding invitation was sent to us by Mr Brown.

8 The citizens should be informed as soon as possible.