Passive or active?

One of the famous exlorers, Peter, reached the tundra. The tundra

• is reached by him

• has been reached by Peter

• was reached by him

• was being reached by Peter

He saw / was seeing lots of seals there. Lots of seals...

• are seen

• were seen

• were being seen

• had seen

Seals ... (hunt) by many Inuits for their furs ever since.

The poor animals ... and their bodies are just ...

• are killed; thrown

• have been killed; throwed

• were killed; throwned

• will be killed; thrown

Ecologists ... (try) to struggle for a long time now

Many people have been telling this relatively sad story to their children in order to prevent them from keeping this tradition. This story ... (tell)

Similar things happen to whales, which ... for generations.

• are catching

• are caught

• are being caught

• have been caught

Although their species ... they are still killed.

So the struggle for protecting them ... (carry) on.

There is no doubt that whales and seals must ... (protect).