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Có 4 dd Ca(OH)2, NaCl, HCl, NaOH đựng trong 4 lọ mất nhãn. Chỉ dùng QT và cacbon đioxitc hãy trình bày cách nhận biết từng lọ hoá chất trên
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1.You should stay inside ............... recess. * at for on in 2.Eating vegetables is good ..... your health. * at with for to 3.We ........ to school on Sundays. * not to go doesn't go don't go not go 4.Mary was sick, she ...... to class yesterday. * not go didn't go not to go didn't went 5.Rewrite this sentence: Don't forget to brush your teeth. * Do remember brush your teeth. Remember to brush your teeth To remember brush your teeth. Remembered to brush your teeth. 6.You must ..... your hands at least 20 seconds to protect yourself from the virus. * washed wash to wash washing 7.There is a good ....... of meat on the stall. * select selection selective selected 8.My aunt would like ....... some fruit and vegetables * buy buying bought to buy 9.They walked around the market, then ...... at a fruit stall. * stoped stop to stop stopped 10.Yesterday, Hoa and her aunt ...... to the market. * went gone go goed 11.Hoa ....... late yesterday morning, so she missed her Math class. * gets up get up geted up got up 12.There ...... only one disease called common: the common cold. * is be are tobe 13.The weather ............. awful today. * are is was were 14.Did her mom write a sick note? No, she ........ * didn't don't doesn't won't 15.Rewrite this sentence: What is your height? * How old are you? How tall are you? How are you? How you are tall? 16.She is hungry. I am, ............... * either too so neither 17.Be careful! A car ..................... * to come came come is coming 18.Where ....... Hoa yesterday? She had a trip with her friends to Hue. * were was is be 19.Next year, they ...... a new bridge in our village. * bulid to build will build builds 20.I don't like papayas. ............. does my mom. * Too So Either Neither

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