A= 1/1x21 + 1/2x22 + 1/3x23 + ... + 1/80x100; B= 1/1x81 + 1/2x82 + 1/3x83 + ... + 1/20x100

52. Is/ Nile/ longest/ river/ world?A.Is the Nile the longest river in world?B.Is Nile the longest river inthe world?C.Is the Nile longest river in the world?D.Is the Nile the longest river in the world?53. This site/ famous/ thrilling/ scenery.A.This site is famous thrilling scenery.B.This site is famous as thrilling scenery.C.This site is famous for thrilling scenery.D.This site is famous with thrilling scenery.VII.Fill in the blank:If you plan a visit in October, don’t miss the Harvest Festival. The festival offers a variety of (54) ______ for all age groups and interests. Children may enjoy (55)______ to traditional stories and learning folk dances. Adults (56) ______ enjoy the antique show and the crafts fair. Other attractions (57) ______ a celebration of musical heritage and demonstrations of traditional skills (58) ______ candle making, butter churning and bee keeping. The festival (59) ______ at the County Fairgrounds. Space is available for you to (60) ______ your car at the festival at no extra charge. The admission fee is donated (61) ______ the Preserve Our History Fund.54.a. actions b. acts c. activities d. actors55. a. hear b. hearing c. listen d. listening56. a. will b. must c. would d. used to57. a. contain b. consist c. include d. have58. a. examine b. as well as c. as long as d. such as59. a. held b. holds c. is holding d. hold60. a. put b. lay c. park d. stand61. a. for b. to c. on d. withVIII.Read the passage and choose the best answer to each statement.

Da Nang is one of the most peaceful cities in Viet Nam with a lot of beautiful beaches. This is a wonderful place for those who love seas and enjoy fresh air. Life here is not so busy as that in Ho Chi Minh City. It is not only a beautiful city but also a safe place to live in. Every evening, after work, you can easily catch the sight of families riding to the beach, leaving their motorbikes on the seaside and jumping into the water. They are not afraid of losing their motorbikes. They believe that their vehicles will still be there when they come back. There is no beggar here and the air is fresh. Another good thing is the food. If you love seafood, Da Nang will be the right choice. The food here is very fresh and the price in cheaper than that in Ho Chi Minh City.62. Da Nang is a good place for sea lovers.A. Right B. Wrong C. Doesn't sayD. Not sure63. The life in Da Nang is busier than that in Ho Chi Minh City.A. Right B. Wrong C. Doesn't sayD. Not sure64. There are beautiful mountains in Da Nang.A. Right B. Wrong C. Doesn't sayD. Not sure65. It is not expensive to buy seafood in Da Nang City.A. Right B. Wrong C. Doesn't sayD. Not sure

36. There is afamilyphotothewall.A. in B. onC. atD. with37. We needsomechairsthe kitchen.A. with B. on C. in D. at38. I live __________ my parents and my younger brother in a town house _________ Nha Trang. A. at –at B. with –in C. with –atD. of –in39. There are two lights _________ the ceiling.A. in B. at C. on D. between

40. There are some dirty dishes __________ the floor.A. on B. withC. in D. forV.Rearrange sentences to make meaningful sentences:41. at/ My/ is/ 255/ Tran Phu street/ house.A.My house is at 255 Tran Phu street.B.My house is 255 at Tran Phu street.C.My house is Tran Phu street at 255.D.My house at 255 is Tran Phu street.42. do/ we/ going/ What/ to/ are/ tonight?A.What we are going to do tonight?B.What are we going to do tonight?C.What do we going are to tonight?D.What do are we going to do tonight?43. convenient/ both/ This apartment/ and/ is/ modern.A.This apartment both is modern and convenient.B.This apartment is both and modern convenient.C.This apartment both modern and is convenient.D.This apartment is both modern and convenient.44. higher/ building/ This/ that/ is/ than/ one.A.This is building higher than that one.B.This building is higher than that one.C.This building is one than higher that.D.This building is that one higher than.45. The/ beautiful/ with/ park/ is/ green trees.A.The park is beautiful with green trees.B.The park is green trees beautiful with.C.The park beautiful with is green trees.D.The park is with beautiful green trees

Bài 19 : Cho n điểm phân biệt . Cứ qua hai điểm về một đường thẳng . b ) Nếu n = 30 và trong đó có 10 điểm thẳng hàng thì có tất cả bao nhiêu đương thẳng.