11. A healthy future - 12. Incredible wildlife » Стр.50 (1)

Grammar 1. Complete the conversation with might, must, can’t or could. A: What’s that? Oh, I know, it (1) might be a big cat. B: Mm, I don’t think so. It (2) can’t be an elephant because it’s too small. A: Right, but it’s an African animal. It (3) could be a rhino but it’s the wrong colour. B: I know! It (4) must be a giraffe – look at its skin!