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.

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