II. Read the following passage and fill in the gaps with one suitable word ( 5p)
What is the truth about light wave theory? ……56……. many years, scientists were in disagreement. Newton hypothesized that light traveled ……57…….. in a denser medium, like a wave. On the other hand, Christian Huygens in 1690, postulated that light wave slowed down in a denser medium, like particles. The problem is that it was impossible to ………58……. the speed of light accurately. However, in...
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II. Read the following passage and fill in the gaps with one suitable word ( 5p)
What is the truth about light wave theory? ……56……. many years, scientists were in disagreement. Newton hypothesized that light traveled ……57…….. in a denser medium, like a wave. On the other hand, Christian Huygens in 1690, postulated that light wave slowed down in a denser medium, like particles. The problem is that it was impossible to ………58……. the speed of light accurately. However, in 1850, Leon Foucault made the first accurate ……59…. His result supported the wave theory for light. The theory was accepted until the late 19th century when Einstein discovered that light striking a surface caused particles to …60…….. their speed. This marked a return to contradiction and disagreement.
*Rewrite the following sentences
1.She eats more chocolate than I
->I eat less chocolate than her.
2.Vinh keeps forgetting his homework.
->Vinh is always forgetting his homework.
3.Keeping the environment clean is very important.
->It's verry important to keep the environment clean.
4.No one helped Lan to do the homework.
->Lan isn't helped to do the homework.
5.Tam doesn't type as fast as she used to.
->Tam used to type faster than now
6.How long is it since you used the car?
->When did you use the car ?
7.Nam is very strong ,he can do heavy work.
->Nam is strong enough to do heavy work.