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tranbathien207
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Tính : $\frac{1}{54}$ < $\frac{1}{15^{2}}$ + $\frac{1}{18^{2}}$ + $\frac{1}{21^{2}}$+...+ $\frac{1}{1^{300}}$< $\frac{1}{36}$
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III. Give the correct form of the following verbs: ( 2 pts) 1. 1. They ………………………(play) football at 10a.m tomorrow morning. 2. Radio waves…………………….. ( discover ) by Heinrich Hertz. 3,Scientists are planning ……………( send) people to explore Mars. 4. Future homes ……………(locate) on the ocean.. 5. I think robots ………….( help) us do many difficult jobs. IV. Give the correct form of the word ( 1pt). 1. Thomas Edison was one of the greatest…………..of the world. ( invent) ). ......................... 2. There are a lot of…………….differences . culture ) ....................... 3. …………….. pollution has risen day by day. ( environment ) ....................... 4. There have been major new ………….. in space reseach. ( develop ) ........................ 5. Sugar is not …………… food. ( health) V. Complete the following passage then answer the questions: (1.0point) hard known interest telephone Alexander Graham Bell is widely …(1) as the inventor of the first telephone.He was born on March 3rd,1847 in Edinburgh,Scotland.When he was 23,Bell emigrated to Canada with his parents and the next year moved to the United States to teach deaf-mute children.He took great ..(2)…. in transmitting the human voice.With his colleague Thomas Watson, Bell worked very …(3)……….. on the experimentation to invent devices such as the harmonic telegraph( used to send multiple messages overa single write ) and phonautograph( used to draw the shape of the sound waves).The first …(4)…………… communication was said to have happened between Bell and Watson in 1876 while Bell was at one end of the line , and Watson worked on the telephone in another room. The first transmitted words were,” Mr Watson , come here I want to see you.” 1.Who is Alexander Graham Bell?...................................................................................................... 2. When did he move to Canada?..................................................................................................... 3. What was he interested in ?..................................................................................................... 4. What was the first telephone communication ?............................................................................ VII. Rewrite the following sentences without changing their original meanings.(1 pt) 1. Nam said “I am told to be at school before 7 o’clock” ………………………...………………………………………………………………………

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