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it is dangerous to ignore their foreign friends it is important to maintain their leading role in world affairs it is necessary to use several languages in public places it is time to get acquainted with other cultures
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It’s necessary for me to finish it. It’s impossible for me to finish it. It’s important for me to finish it. It’s easy for me to finish it.
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You mustn't take sleeping pills in order to get a good night' s sleep. You should stay up if you want to sleep effectively. Food is necessary at night if you fail to go to sleep. It is very important to get out of the habit of taking a nap after dinner.
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