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1. Open the brackets and fill in the blanks with the appropriate forms of the verbs must, have to or be to.
1. You___(not tell) him about it. It's a secret. 2. It looks like rain. You___(take) your raincoats. 3. You ___(not talk) so loudly here.4. Inhis youth he ___ (work) from morning till night to earn his living. 5. He ___(wait) at the station till it stopped raining. 6. The secretary informed us when the manager___(come). 7. They___(leave) on Saturday, but because of the delay with their visas they___(book) tickets for Monday. 8. They___(not tell) him anything about it before they
get further instructions. 9. He___(leave) for London that night. 10.___I (do) it all by myself? 11. It was too late to change their plans and they___(put up) with it. 12. You___(not prepare) all this work, I will help you. 13. Stay here till she is free. I think you___(not wait) long. 14. We___(conduct) a series of experiments this week. 15. Remember that we___(be) at this place not later than noon.