4. Complete the sentences with the correct modal verb. Sometimes more than one answer is possible.

A: What are you reading? And what is that? B: It's an amazing animal. It *must* be very clever to do the things it does. A: Right! It *must* be from Europe! Look at those trees and the background! B: No, I think it *could* be from South America somewhere. I haven't finished reading it yet! A: Well, I *must* do my 'wonderful animals' project about this! Can I have the magazine?