We are leaving tonight, so you ... buy a ticket for the flight., should, must, have to, mustn't, ... I come in?, can, could, may, might, David ... cook well when he wants to., can, could, might, should, Jenny ... to be more careful while picking up heavy things., could, must, should, ought, The letter ... arrive tomorrow., have, is expected to, need to, is able to, I ... sleep. It's too noisy., can't, must, mustn't, don't need to, Nicole ... pick us up, but she is late., need to, had better, is supposed to, can't, We've got a lovely room in the hotel. We ... see the sea., can't, are able to, need to, have to, Take an umbrella with you. It ... rain., might, can't, had better, ought to, We ... not talk so loud. Someone will hear us., had better, can, ought, need, Close your textbooks. You ... use them now., shouldn't, don't need to, needn't to, aren't able to

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