rút gọn x^2- y^2/ x+y . (x+y)^2/x + y^2/ x+y . (x+y)^2 /x

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II- Verb form : 1. This is the first time we (see) Scotland, so it’s all new to us 2. Michael Caine (be) to London two times this year 3. We (visit) Switzerland four times during the 1970s 4. Nobody can persuade her (change) her mind 5. Are Alice and Tom still living in New York? –No, they just (move) to Dallas 6. David (be) born after his father (die) 7. He told me that he (meet) me at the airport the next time I came 8. The leaves (fall) from trees when autumn (come) 9. When he (receive) the photographs next week, he (show) them to you 10. We (talk) of nothing since you (leave) 11. Almost everyone (leave) by the time we (arrive) yesterday 12. She (be) ill for several months 13. What you (do) at one o’clock this morning 14. Up to now, the teacher (give) our class five tests. 15. “We’re still looking for Mark” . “Hasn’t he (find) yet?” 16. Tomorrow we (leave) this place. I (wait) for this 17. Don’t forget (lock) the door before (go) to bed 18. I can’t wait until the weekend (come) 19. You (manage) (finish) (pack) these parcels last night? 20. It is a grey day today. The sun (not shine) 21. Mary (drive) to work every day, but today she (wait) for the bus 22. These boys (work) in the garden for three hours 23. There is an international football match on TV tonight. Liverpool (play) against Manchester 24. I arranged (meet) there here 25. Are you free this afternoon? No, I am not. I (attend) a lecture given by Professor Jones 26. He dreads (have) to retire 27. The roads (widen) so we have to find another way 28. My uncle (not give) up (smoke) after the doctor (tell) him he risked (have) a heart attack if he continued giúp mình với