Put in 'must' or 'can't'

IV. Put in 'must' or 'can't'

1) Why is that man looking around like that? He _ be lost.

2) That woman __ be a doctor! She looks far too young.

3) John always fails the tests, even though he's clever. He study enough.

4) The food is really good at that restaurant. They have a great chef.

5) Who's that at the door? It be Susie - she'll still be at work now.

6) This be John's house. This house has a red door and it's number 24, just like he said.

7) Julie ___ have much money or she would buy a new car. Her old one is falling apart.

8) He be at work now, can he? It's nearly midnight.

9) What a lot of lovely flowers you have! You _ really like gardening.

10) David _ drink a lot of coffee. He's finished two packets already this week.

11) This ___ be Jamie's coat. He's tall and this is tiny.

12) Her life ___ be easy. She has four children and very little money.

13) Where's Lucy? She _ be at the library, as she often goes there at this time.

14) This bill ___ be right! £50 for two cups of coffee!.

15) Emma's amazingly good at the piano. She __ practise a lot.

16) The car in front is driving so slowly that I think they _ be looking for something.

17) You've already eaten enough for three people! You still be hungry!.

18) This book belong to the library. It's certainly not mine.

19) It only takes three hours to fly from London to Sydney? That ___ be correct!

20) There ___ be something wrong with the fridge! It's making a very unusual noise.