Question 1

1. The rainforest _____ destroyed by 2010.

Accepted Answer

had been

Answer

was

Answer

has been

Answer

is

Question 2

2. The pollution in the river _____ to dangerous levels by 1990.

Accepted Answer

had risen

Answer

rises

Answer

rose

Answer

had been rising

Question 3

3. Volunteers _____ for hours to clean up the beach when the storm started.

Accepted Answer

had been working

Answer

have been working

Answer

were working

Answer

worked

Question 4

4. By the time we arrived, all the trees _____ cut down.

Accepted Answer

had been

Answer

were

Answer

have been

Answer

are

Question 5

5. The government _____ a new law this year to protect endangered species.

Accepted Answer

has passed

Answer

passed

Answer

had passed

Answer

passes

Question 6

6. The company _____ illegal waste into the river for years before they were caught.

Accepted Answer

had been dumping

Answer

is dumping

Answer

has been dumping

Answer

dumped

Question 7

7. The air quality _____ worse as more cars were added to the road.

Accepted Answer

had been getting

Answer

got

Answer

is getting

Answer

has been getting

Question 8

8. By the time we finished the hike, the sun _____ to set.

Accepted Answer

had started

Answer

started

Answer

has started

Answer

had been starting

Question 9

9. The birds _____ all flown away by the time we arrived at the park.

Accepted Answer

had

Answer

have

Answer

were

Answer

are

Question 10

10. We _____ to recycle more to reduce waste.

Accepted Answer

need

Answer

have needed

Answer

are needing

Answer

needed

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