Giúp mình câu 1 đánh đậm này vs ạ!

71nau an Ya 1.A(n)...is someone you know but he/she is not' your close friend.A. acquaintanceB. friendC. neighborD. classmate- 2 If you only care about your interests and feelings, you are very....A. happy 3: The quality we don't like from a friend is...A. friendliness 4: Do you think our teacher will let us....our dictionaries in reading lessons? B. friendly B. loyaltyC. selfishness D. understanding C. loyal D. selfish. A. to use B. use C. using D. used 5: I was in an ....situation when I finished meal in a restaurant and found out I left my wallet at home A. embarrass B. embarrassing C. embarrassed D. embarrassment 6 She always complains....about anything she doesn't like.A. noise 7 We all said, "........ A. Happy anniversaryB. Congratulations C. Happy New Year D. Happy Birthday to you 8 The ".. ..." is often celebrated on people's 25h wedding anniversaries A. Golden Anniversary B. Diamond Anniversary C. Cotton Anniversary 9 Remember...some presents for Mum on her birthday, Dad.A. to buy 10 I'm sorry you've missed the train, it...five minutes ago.A. has left B. had left 11 Do you want...by the doctor?A. to examineB. to be examinedC. being examined D. being to examine 12 Why didn't you came to my party last night? 13: When he came to the station, the train has left B. noisily C. noisyD. noises !" before Nam blew out the candles on the birthday cake. 66 D. Silver Anniversary B. buying C. and buy D. and buyi C. left D. has been 14: I expect to meet at the airport by my uncle 16. My boss doesn't allow me using the telephone for private calls. 17. I'm sure he is capable in running a mile in for minutes. 18 Good friendship should be based in mutural und 19. I'm delighted hearing that you have made much progress in your study recently. 20. She said the letter was personal and wouldn't let me to reach it. 21. It's impossible for me being there before 8.00 p.m.

Tính : $\frac{2013a-2012b}{c+d}$ + $\frac{2013b-2012c}{a+d}$ + $\frac{2013c-2012d}{a+b}$ +$\frac{2013d-2012a}{b+c}$ biết a/2b=b/2c=c/2d=d/2a

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