Life is __(1)__ more and more convenient. Electricity helps life have __(2)__. A long time ago, before the Christian era, men knew about the __(3)__ of this, but no one had known what electricity was until 1960 when an English scientist showed the world. And it __(4)__ became popular in 1800s. It started helping machines work and we stopped depending so much __(5)__ coal. It started helping people work easier. Now, a lot of household appliances need electricity __(6)__. But electricity is dangerous for people. You should not touch an electrical __(7)__ with wet hands or put plants or vases on any electrical ones. Remember __(8)__ anything into sockets because electricity can kill .
1.A. comingB. gettingC. travelingD. going 2. A. changeB. to changeC. chanceD. choice 3.A. existB. existenceC. existanceD. existant 4.A. beganB. alwaysC. mustD. first 5.A. inB. atC. onD. of 6.A. workB. workingC. to workD. worked 7.A. applianceB. deviceC. objectD. A&B 8.A. to putB. not to putC. puttingD. not putting
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Sinh Học lớp 12
