4 Complete the sentences with the words in the list.

1 A. My leg feels/hurts really badly.
B. Oh, really? Perhaps you should go and see/make an appointment a doctor.
2 A. If I hadn't left/ didn't leave my mobile phone at home, I would call/would have called you.
B. Oh. So that's right/ why you didn't phone me.
3 A. I'm betting/bet you can't say 'Good morning' in five different languages.
B. Well, you're right-of course I can/can't
4 A. You can will never manage to stay off the Internet for two days.
B. Mm, I think you're right, but I challenge / can challenge you to stop using your email for a week!​