Nam và Bắc cùng làm một số dụng cụ. Nam làm trong 5 giờ, Bắc làm trong 4 giờ thì Nam sẽ kiếm được nhiều hơn Bắc 13 dụng cụ. Biết cùng trong 8 giờ thì Nam làm kém Bắc 24 dụng cụ. Hỏi trong 1 giờ mỗi người làm được bao nhiêu dụng cụ?

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I. Combine the pairs of sentences, using Relative Pronouns. 1. My friend is working for an import-export company. The company is located in an industrial zone.  _______________________________________________________________ 2. Rich comes from a country. Its history goes back thousands of years.  ________________________________________________________________ 3. Truong gave me some suggestions. Most of them sound helpful.  __________________________________________________________________ 4. I have two sisters. One of them is a fashion designer.  ________________________________________________________________ 5. These people are very enthusiastic. They volunteer to do charity work.  _________________________________________________________________ 6. I’m going to be interviewed for my new job. That makes me nervous.  ________________________________________________________________ 7. Hue is famous with many kinds of festivals. It is admitted as world’s cultural heritage.  __________________________________________________________________ 8. These wild animals are in danger. People are working hard to save them from being extinct.  __________________________________________________________________ 9. Dr. Fields predicted another earthquake. He lectured at Browning Hall last night.  _________________________________________________________________ 10. Max attends a training course to become a pilot. He is very intersted in flying.  _________________________________________________________________ 11. The Great Wall of China can be seen from the moon. It is one of the great wonders in the world.  ________________________________________________________________ 12. We visited Belgrade. It is the capital of Yugoslavia.  ________________________________________________________________