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Tính vận tốc trung bình của một ô tô biết rằng trong nửa thời gian đầu xe đi với vận tốc 40 km h 2/3 quãng đường còn lại đi với vận tốc 50 km h và cuối cùng đi với vận tốc 60 km h
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Dear Jane, I'm sorry for not (31) to you for two months. In my postcard sent to you when I was on vacation in July, I told you about a new friend of (32) , Lisa Moran, who lives near my uncle's farm in Napan Valley, California. You may be curious to know what she is (33) . Well, Lisa is of our age - 17 - and not very tall or slim. In fact, she has (34) rounded shoulders and a plump face. The best (35) on Lisa's face are her green eyes and the two dimples on her checks. She (36) lively with her hair cut short and dressed in (37) clothes - jeans and a T-shirt. When I first met her at my cousin's birthday party, I was attracted by her (38) and pleasingly direct manners. Curiously enough, Lisa has the same (39) in music as you and I. That's (40) about Lisa for the moment. How have you been doing with your school work? Please write soon. Best wishes Ann Maxfield 31. a. write b. to write c. writing d. wrote 32. a. I b. me c. my d. mine 33. a. looking b. like c. seen d. similar 34. a. slightly b. hardly c. scarcely d. reasonably 35. a. aspects b. points c. features d. marks 36. a. feels b. seems c. appears d. looks 37. a. casual b. formal c. sports d. trendy 38. a. light-hearted b. high-handed c. self-centered d. easy-going 39. a. taste b. hearing c. sense d. way 40. a. all b. enough c. end d. most

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