Cho tam giác ABC vuông tại A có AB=8 cm,BC=10cm a) Tính AC? b) Kẻ đường cao AH. Tính độ dài AH? c) Trên tia đối của tia A HA lấy điểm D sao cho HD=HA. Tính độ dài CD?

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I. Choose the correct option for each gap in the sentences. 7. This shirt is much prettier, but it costs _____the other one. * A.so much as B.as many as C.twice as many D.twice as much as 1. I got up late, _____ I didn’t have time for breakfast. * A.because B.so C.as D.although 2. If you listen to the teacher attentively, you _____ how to do this exercise. * A.understood B.will understand C.would understand D.are understand 4. _____ he wasn’t invited, he went to the party. * A.s B.ecause C.So D.Although 8. Don’t worry about her _____. * A.complanation B.complaination C.complaint D.complaintment 9. What would you like to eat for lunch? - _____, I don’t mind. * A.Anything B.Every thing C.Nothing D.Something 6. They warned us _____ to the seaside in that month. * A.not to go B.not to going C,not go D.to not go 10. If today _____ Sunday, we’d have a day off. * A.will be B.isn't C.is D.were 3. My mother told me _____ so much noise at night. A.to not make B.making not C.not to make D.not making 5. Several important methods were _____ for preserving food in the nineteenth century. * A.covered B.seen C.invented D.prepared II. Give the correct form of the words in the brackets. 17. It is _____ to eat too much sugar. (HEALTH) 11. These shoes look quite smart but they’re terribly _____. (COMFORT) * 12. Switzerland and Australia are both _____ countries. (MOUNTAIN) * 14. Women nowadays have more _____to participate in social activities. (FREE) * 18. There are many cultural _____between his country and mine. (DIFFER) * 19. My brother often does experiments about electricity for _____ (PLEASE) * 16. You must make a quick _____ about who wins the contest. (DECIDE) * 20. The train made a late _____. (DEPART) * 13. I’ll always remember that journey. It was an _____ experience. (FORGET) * 15. Television is one of the cheapest forms of _____ . (ENTERTAIN)