Bài 21*: Tìm hai số tự nhiên a và b biết a)UCLN(a,b)+BCNN(a,b)=19 b)BCNN(a,b)-UCLN(a,b)=5

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I.WORD FORMS 1.Bruce plays table tennis very............ (good) 2.My sister is a.........girl (beauty) 3.Tom is a good soccer............ (play) 4............is his favorite sport (swim) 5.Mary is ............ in listening to Pop music (interest) 6.You should............ after school (relaxing) 7.There are a lot of.......... flowers in the park (beautifully) 8.His father goes..........every morning (jog) 9.It’s raining.......... at this time (heavy) 10.Hung and Tan are my best................ (friendly) Answer: 1.............. 2............. 3............. 4.............. 5............. 6............. 7............. 8............. 9.............. 10............. II. WRITE a. Rearrange: 1.your mother /at the present /is/ doing /what? → .......................................................................................... 2.goes walking /in the mountain /often /he. →........................................................................................... 3.fly our kites /usually /on Sundayafternoon /we. →........................................................................................... 4.goes shopping /her mother /always /with/ Mary. →........................................................................................... 5.skip rope /every day /these girls /do? →........................................................................................... 6.go camping /every week /they /don’t. → .......................................................................................... 7.at the moment /are playing soccer /the students /in the school yard. →........................................................................................... 8.you/ with/ go fishing/ do/ usually/ who? →........................................................................................... 9.Peter/ in his room/ now/ his homework/ is doing. →........................................................................................... b. Transformation 1.We like basketball very much. →Our favorite ................................................................ 2.The people don’t have a tent so they never go camping. →The people never go ...................................................... 3.We usually walk to the park. →We usually ................................................................. 4.Her father always goes to work on time. →Her fatheris ............................................................... 5.What does his sister play? →Which ...................................................................... 6.The students don’t go to school on Sundays. →The students ............................................................... 7.I love reading comic books in my free time. →I am ......................................................................... 8.They travel to Nha Trang beach two times a year. →They travel ............................................................