Complete the sentences with the verbs below. defend • threaten 3 The population of Venice will even more if the house prices continue to rise. 6 A decreasing population and…

3 The population of Venice will threaten even more if the house prices continue to rise.

6 A decreasing population and flooding are two problems that defend Venice.

(Note: The verb "defend" might not fit well contextually in the second sentence; "threaten" could be a better choice based on context, but it needs to align with the grammatical structure of the sentence provided.)

If you meant to say that the problems "threaten" Venice, then:

6 A decreasing population and flooding are two problems that threaten Venice.