5. His business is going badly he'll have to stop doing it soon. (CLOSE)

->His business is going badly, so he’ll have to close it down soon.

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close down: đóng cửa, dừng hoạt động

6. My aunt has got two teenage children, but they don't seem to have a good relationship with each other. (GET)

->My aunt has got two teenage children, but they don't seem to get on well with each other.

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have a good relationship with=get on well with=be on good terms with: có mối quan hệ tốt với ai

5. His business is going badly, he'll have to close it down soon

 - close down: đóng cửa, cho ngừng hoạt động

 Dịch: Doanh nghiệp của anh ta đang đi xuống, chắc hẳn anh ta sẽ sớm cho nó ngừng hoạt động thôi. 

6. My aunt has two teenage children, but they get on with each other.

 - get on: hòa thuận, ăn ý.