She hasn't eaten anything since yesterday. She can be very hungry

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13. She hasn't eaten anything since yesterday. She can be very hungry.
A
B
C D
14. His teacher was very angry with him. He mustn't have said that to her.
A
B
C
D
15. Children should obey their parents and teachers.
A
B C
D
16. You might try the cheese soufflé. It's really good.
A B
C
D
17. You needn't solve a problem until you identify it correctly.
A
B
C
D
18. Be careful with the knife! It's very sharp, you must cut your finger.
A
B
CD
19. Pam can't have cooked since we ordered some pizzas.
A
C
D
B
20. They said that you shouldn't use your mobile phone at the cinema.
A
B
C
D