a, Chứng tỏ rằng: 7^20+49^11+343^7 chia hết cho 57 b, Tìm số nguyên n lớn nhất sao cho n^150<5^225

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Mọi người giúp mk gấp với toàn trắc nghiệm thôi 1.My father had gone home before we arrived. A: After my father arrived, we went home. B: After my father had gone home, we arrived. C: After my father had gone home, we arrive. D: After my father had gone home, we had arrived 5.Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. He’s so brilliant and he can do anything. He is ______. A: out of this world B: it’s over the moon C: once in a blue D: the sky’s the limit 6.If there ______ so many new words, it would be easier to master English. A: aren’t B: are C: were D: weren’t 7.The children couldn"t go swimming because the sea was too rough. A: The children couldn’t go swimming because of the sea rough B: The children couldn’t go swimming due of the rough sea. C: The children couldn’t go swimming because of the rough sea. D: The children couldn’t go swim because of the rough sea. 8.I used a credit card to buy a computer game. The game is called ‘Mars Mystique Mission’. A: I used a credit card to buy the computer game is called “Mars Mystique Mission”. B: I used a credit card to buy the computer game which called “Mars Mystique Mission”. C: I used a credit card to buy the computer game which is called “Mars Mystique Mission”. D: I used a credit card to buy the computer game what is called “Mars Mystique Mission”. 11.Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “Can you see anything from there? - “______” A: A small red house, a garden and a lake. B: Wow, it’s beautiful! C: No, thanks. D: You look so excited! 12.Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. The picture reminds him of the time______ he studied in New York. A: when B: where C: which D: why 14.Christer Fuglesang said he enjoyed floating around in the ______ environment. A: homesick B: heavy C: quiet D: weightless 16.I think you should spend more time improving your pronunciation. A: If I were you, I would spend more time improving my pronunciation. B: If I am you, I would spend more time improving my pronunciation. C: If I am you, I will spend more time improving my pronunciation. D: If I were you, I will spend more time improving my pronunciation. 17.Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. Can you read and write well in English but cannot speak ______? A: fluently B: fluency C: fluent D: more fluent 19The plants may develop differently. The plants live on that island. A: The plants live on that island may develop differently. B: The plants that lives on that island may develop differently. C: The plants that live on that island may develop differently. D: The plants which lives on that island may develop differently. 21.Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. He is not exactly rich, but he certainly earns enough to______. A: get down B: get on C: get up D: get by 24.Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. Quang plays the piano very well. He lives next door. A: Quang, whom lives next door plays the piano very well. B: Quang, whose lives next door plays the piano very well. C: Quang, that lives next door, plays the piano very well. D: Quang, who lives next door, plays the piano very well. 26.Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. The book is interesting. It was bought last night. A: The book is interesting which was bought last night. B: The book which was bought last night is interested. C: The book which bought last night is interestingly. D: The book which was bought last night is interesting. 27.Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. The launch of the Space Shuttle Endeavour______broadcast live this morning. A: was being B: was C: is D: had been 30.I’m so excited. I’m going on vacation with my family tomorrow. A: I’m not excited that I’m going on vacation with my family tomorrow. B: I’m excited that I’m going on vacation with my family tomorrow. C: I’m so excited so I can go on vacation with my family tomorrow. D: I’m so excited because I can’t go on vacation with my family tomorrow. 32.“Let’s have some coffee.” - “______” A: Sorry. B: Yes, spot on! C: Once in a blue moon. D: I’d love to but I may be awake at night 38This is the bicycle ______ I bought yesterday. A: who B: whom C: where D: X 39.As soon as the spacecraft______into space, the crew started to observe the sun. A: had travelled B: travelled C: was travelling D: has travelled