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Use each modal verb (can, may, must, need, have to) in the correct form twice:
1. You __ knock at the door. I have got the key.
2. You __ see the film. It is really interesting.
3. - __ I come in? - Please, do.
4. When I was a child I __ read and write.
5. The buses were all full. I __ go on foot.
6. Students __ never use dictionaries while doing the test.
7. I I have lost the keys. I __ enter my flat.
8. You __ put on a coat. It is going to be warm.
9. When her parents were away, she __ cook all her meals herself.
10. - __ I come in? - I'm afraid not.