1) If you are tired, you __________ have a sleep. a) should b) have to 2) My sister is 18 now, so she _______ pay the full price for the ticket. a) has to b) should 3) You _________ drink plenty of water when you're out in the sun. a) should b) have to 4) He ____________ tidy his room. There is a big mess. a) shouldn't b) has to

Modal verbs should, have to

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