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ntbtho25
2 năm trước
Bài Tập:Phân tích : a)N= $z^{2}$ - $y^{2}$ - `6xy` - 9 $x^{2}$ b)P= $x^{3}$ +$y^{3}$+ $z^{3}$ - `3xyz`
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Exercise 1: Give the correct forms of the verbs in the blankets. Question 1: When I______(see) you tomorrow, I______(tell) you my news. Question 2: By the end of the month the estate agent______(sell) twenty houses. Question 3: When I______(wait) for the bus, I saw my close friend. Question 4:______She______(study) English since she______(be) four years old. Question 5:______We______(study) while they are going out. Question 6: As soon as we______(get) there, we______(phone) for a taxi. Question 7:______He______(see) 10 mice when he______(come) into the room. Question 8: We went home when we______(finish) our work. Question 9: When I was going to the door, the phone______(ring). Question 10: I will go to the library before I______(do) the shopping. Question 11: At this time last night, I______(learn) while my father______ (watch) TV Question 12: He______(watch) TV when I come to see him. Question 13: He______(live) in New York for 4 years before he______(move) to New York. Question 14: We______(send) a report as soon as we______(finish) our work. Question 15: We______(wait) here until the rain______(stop). Question 16: He will go home as soon as he______(finish) his work. Question 17: At 11:30 tomorrow, we______(have) lunch in our friend’s house. Question 18: His health has improved since he______(return) from the hills. Question 19: The Chinese______(make) spaghetti dishes for a long time before Marco Polo______(bring) it back to Italy. Question 20: It is the first time he______(drive) a car. giúp mình với

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