[...] Sharks also get caught in the huge fishing nets that are used nowadays on factory ships, .....(29) do many other sea animals. So in general, sharks are not such a danger to humans. They usually eat seals, sea lions and other sea mammals. But as sharks are attracted by movement,..... (30) they see a person swimming in the sea, they could accidentally attack him or her.

.....(31) at the top of the food chain, however, sharks keep populations of other fish healthy and are essential for keeping our seas alive. This is..... (32) we must act now as their time seems to be running out
giúp e vs ạ e cmon huhu.