1.The old concerns lose importance and some of them vanish altogether.
A. develop B. disappear
C . linger D. renew
2. In the United States educational system, intermediate school is the transitional phase between the primary grades and high school.
A. stage B. notion
C . pattern D. alternative
3.Fluoride deters tooth decay by reducing the growth of bacteria that destroy tooth enamel.
A. facilitates B. overwhelms
C . inhibits D. loosens
4. The firm of Bonnin and Morris in Philadelphia was probably the first American company to manufacture porcelain.
A. silverware B. crystal
C .china D. linen
5.Gunpowder was used extensively in firearms prior to 1890.
A. in B. around
C . from D. before
6.We packed up the things I had accumulated over the last years and left for good.
A. close B. near
C . past D. final
7.The chemical is lethal to rats but safe to cattle.
A. toxic B. harmful
C . deadly D. contagious
8.She is very conscientious about her work.
A. worried B. careful
C . anxious D. nervous
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