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2 năm trước
nêu ý nghĩa cthh a.amoni nitric (nh4no3) b.canxi đihidrophotphat(ca(h2po4)2)
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1. I ........swim in this river when I was young A.was used to B.am used to C.used to D.use to 2. She came into the room while they........television A.are watching B.were watching C.watched D.have watched 3.It’s an hour since he......, so he must be at the office now A.is leaving B.was leaving C. Has left D.left 4.He........up his mind yet A.hasn’t made B.didn’t made C.wasn’t making D.wasn’t made 5.By the end of next year, George.........E for 2 years A.will learn B.will have learned C.would learn D.has learned 6.The children are still ill but they.........better gradually A.getting B. Get C. Are getting D. Are got 7.Tom and Mary.......for VN tomorrow A. Have left B.Leaving C.Leave D.Are leaving 8.My mother......in this factory since 1990 A. Works B. Worked C. Had worked D. Has worked 9.I.......about him when he suddenly came in A. Am talking B. Talked C.was talking D.talk 10. He will finish this work before you......here tomorrow A.would leave B.Are going to leave C.Will leave D.leave 11.He....in this office for 10 years by next Monday A.will be working B.would be working C.will work D.will be been working 12.I don’t feel good. I........work tomorrow A.won’t be going B.went C.has worked D.works 13.He is tiredbecause he.......all day A.had worked B.worked C.has worked D.works 14.I......my driving test on Friday last week A.had passed B.have passed C.was passing D. Passed 15. The motoway......in 1986 A.finished B.has finished C.finishes D.was finished GIÚP MK VS

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