True

Script:

Nam: Hi, Mai. How's your mid-term project going?

Mai: Good! I'm trying to complete it by next Monday. But I'm still working on the last part: saving endangered animals. Do you have any ideas, Nam?

Nam: Well, I think the first thing you should do is help people understand the importance of this problem.

Mai: Yes, I agree. Some people think this is a natural process that would happen with or without humans. They also believe that's not their responsibility.

Nam: You should also do some research on the number of endangered animals. We are losing animals quicker now than ever before. And one of the reasons is illegal hunting.

Mai: Yes, hunting causes a lot of suffering to wild animals. It destroys their natural habitats, and leaves baby animals behind to die.

Nam: Well, I think strict laws can really help. Heavy punishment may prevent people from illegal hunting. Besides, wildlife trade should be banned as well.

Mai: That would stop illegal hunting. Any more ideas, Nam?

Nam: And we should make sure that the souvenirs we buy on holiday are not made from endangered animal parts.

Mai: That's true. Thanks, Nam! You've been so helpful.

In big cities, the exhaust fumes build (5) ________ and pose a health hazard to human beings.