BUILD YOUR VOCABULARY Look at the words in blue in the text. Which two words are verbs? Use the words to complete the sentences. 1 Sharks don't often humans. 2 There are — 6, 000 wild tigers in the world. 3 Some people are trying to — endangered animals. 4. There are more people who die in — with chairs than with animals. 5 Human — are changing the climate. 6 There is a lot of — in big cities.