(  )16.Newton made                   discovery which completely changed            man’s understanding of color.
    A. a ,/  B. a ,the  C. /, the D. the ,a
(  )17.It is ___world of wonders, _____world where anything can happen.
    A. a. the B. a, a C. the, a D. /,/
(  )18.The Wilsons live in ______A-shaped house near the coast . It is _______17th century cottage.
    A. the, /  B. an, the  C. /, the D. an ,a
(  )19.Tom owns ______larger collection of ______books than any other student in our class.
    A. the ,/ B. a,/ C. a ,the  D. /, the
(  )20.For a long time they walked without saying ___word .Jim was the first t break _____silence.
    A. the,  a  B. a ,the  C. a ,/ D. the,/
(  )21.There was ____time _____I hated t go to school.
    A. a ,that  B. a ,when  C. the ,that D. the ,when
(  )22.When you finish reading the book ,you will have ______better understanding of ______life.,
    A. a,  the  B. the .a  C. /,the  D.a,/
( )23.I earn 10dollars ____hours as ____supermarket cashier on Saturday.
    A. a,  an  B. the ,a C. an ,a  D . an ,the
(  )24The sign reads “in ease of___fire ,break the glass and push _____red button”
    A. /,a   B. /,the  C. the ,the  D. a ,a
(  )25.I don’t like talking on ______telephone ; I prefer writing ____letter.
    A. a,  the  B. the./  C. the ,the  D. A ,/
(  )26.Jumping out of ____airplane at ten thousand feet is quite _____exciting experience.
    A. /, the   B. /, an  C. an. an D. the, the
(  )27.One way to understand thousands of new words in gain _____good knowledge of basic word formation.
    A. /  B  the  C. a  D. one
(  )28.The cakes are delicious . He’d like have ______third one because _____second one is rather too small.
    A. a, a  B. the .the  C. a ,the D. the ,a
(  )29.A bullet hit the solider and he was wounded in ____leg.
    A. a   B .one   C. the  D. his
(   )30.The warmth of _____sweater will of course be determined by the sort of ___wool  used.
    A. the, the  B. the ,/  C. /, the  D. /,/