Một vận động viên bơi lội tác dụng một lực đẩy hướng ra theo phương ngang có độ lớn trung bình 70N. Chiều dài mỗi sải tay bơi của anh ta là 1,65m. Tính công suất của cánh tay anh ta đập tay 100 lần / phút.

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II. Circle the best word or phrase (A, B, C or D) to complete each sentence below (2points) 1. The Japanese eat a lot of fish and healthy food,______ they live for a long time. A. so B. because C. or D. but 2. Did you buy _______ bottle of cooking oil yesterday? A. some B. a C. any D. an 3._________! Can you tell me the way to the post office? A. Thank you B. All right C. Listen D. Excuse me 4. Last year, Phuc participated in _______ funds for street children. A. raising B. making C. gathering D. taking 5. She __________ blood twenty times so far. A. donates B. has donated C. is donating D. to donate 6. ___________ to England? -Yes, I went there three years ago. A. Did you ever go B. Do you ever gone C.Were you ever D. Have you ever been 7. Nam: _____________________? What should we do first? Nga: First, put some cold water in a pot and heat it until it boils. Then …. A. Can you tell me the way to your house? B. Can you tell me how to cook rice please? C. Can you help me with my homework? D. Can you cook? 8. The photos are not really clear, and the writing isn’t, _________. A. so B. too C. either D. neither 9. We hate the dishes. A. wash B. to wash C. washing D. washes 10. There isn’t _______________ for dinner, so I have to go to the market. A. any left B. some left C. any learning D. some leaving III. Write the correct form of each verb in brackets to complete the following sentences (1point) 1. She often (go) ......................... to the market with her mother every weekend. 2. We (visit) ...................... Hue next month. 3. My younger sister (collect) ................. dolls two years ago. 4. .................. you ever (do) ................. volunteer work ? 5. The letters (send) ………………….. everyday.