1. Their son is allergetic to animals. They decided to get a cat. (though)

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2. He will stay in England for two months more. He can perfect his English. (in order that)

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3. There is nothing to eat. We have to go shopping today. (as).

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4. I go to Hue next week. I will stay with my aunt and uncle. (when)

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5. Mai could have good marks. She studied hard for the exam. (so as to)