Cách làm cho bạn:
If the wheel didn't exist, we couldn't travel by car or bus.
If we didn't have aeroplanes, journeys would take much longer.
If there were no books, the world would become a much poorer place.
Without new antibiotics, common infections and minor injuries could become life-threatening.
If there were no electricity, there would be no power to use your fridge or freezer, telephone lines would be down and phone signal lost.
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