1. Their son is allergetic to animals. They decided to get a cat. (though)
->
2. He will stay in England for two months more. He can perfect his English. (in order that)
->
3. There is nothing to eat. We have to go shopping today. (as).
->
4. I go to Hue next week. I will stay with my aunt and uncle. (when)
->
5. Mai could have good marks. She studied hard for the exam. (so as to)