Exercise 2.Complete the sentences.
1. I... (could I am able to I can sleep for hours when I was a little girl.
2. Where are my gloves? - I... (can't/ have to / needn't put them on because it's cold today.
3. You ... (needn't/ mustn't I can't take an umbrella today. The Sun is shining.
4.I'm sorry, you didn't invite me to your birthday party. You .. (must/ should / need to ) invite me next time.
5.Well, it's 10 o'clock. I... (can/has to / must ) go now.
6. You ... (would / can't/ shouldn't ) smoke so much.
7.We have got plenty of time. We ... (must/needn't/ should ) hurry.