Trong một khu vườn, người ta trồng tổng cộng 120 cây gồm 3 loại: cam, chanh và xoài. Biết số cam bằng tổng số chanh và xoài, số xoài bằng tổng số chanh và số cam. Hỏi mỗi lại có bao nhiêu cây?

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Choose the best option (A, B, C or D) to complete each of the following sentence. 6. What is your __________subject at school? A. interest B. favorite C. liking D. favorites 7. My favorite subject is ____________ because I like learning about mountains and rivers of different countries in the world. A. art B. geography C. physics D. history 8. In a __________ class, you study about living things like plants and animals. A. literature B. science C. biology D. physics 9. Nguyễn Nhật Ánh is the __________ of several story books for teenagers such as Yellow Flowers on the Green Grass. A. actor B. character C. author D. maker 10. This is a __________ between you and me. Don’t tell anyone about it. A. secret B. mystery C. fantasy D. adventure 11. I don’t like watching horror movies. They’re __________. A. scary B. fantastic C. exciting D. funny 12. Before I buy a new book, I often read __________ about it on the Internet. A. stories B. reviews C. events D. writers 13. Harry Potter is a series of seven __________ novels by J. K. Rowling, a British author. A. adventure B. magic C. secret D. fantasy 14. I want to sign up __________ the Music Club this year. A. in B. at C. for D. by 15. I __________ playing badminton in my free time. A. want B. would like C. want to D. like 16. Can I borrow your eraser? I can’t find __________. A. yours B. me C. my D. mine 17. You can join one of the three sports clubs this year: badminton, basketball, __________ table-tennis. A. and B. or C. but D. both A and B are correct 18. Our school has three sports clubs this year: swimming, volleyball, __________ soccer. A. and B. or C. but D. both A and B are correct 19. There isn’t a gym __________ a swimming pool near my house. A. and B. or C. but D. both A and B are correct 20. Do you know any other books _________ Nguyễn Nhật Ánh? A. of B. for C. by D. from