Chọn đáp án đúng để điền vào chỗ trống trong các câu sau .
   1.He is ................. singer I've ever met .
        A.worse             B.bad           C.the wrost          D.badly
   2.Mary is ................ responsible as Peter.
        A.more               B.the most         C.much          D.as
   3.It is .................. in the city than it is in the country .
        A.noisily              B.more noisier        C.noisier          D.noisy
   4.He sings .................among the singers I have known.
        A.the most beutiful                  B.the more beautiful
        C.the most beautifully             D.the more beautifully
   5.He is .......................student in my class.
        A.most hard-working               B.more hard-working 
        C.the most hard-working         D.as hard-working
   6.The English test was...................... than Ithought it would be .
        A.the easier      B.more easy      C.easiest       D.easier
   7.Physics is thought to be ..................than Math.
        A.harder            B.the more hard         C.hardest         D.the hardest
   8.Jupiter is ....................planet in the solar system.
        A.the biggest     B.the bigger                C.bigger           D.biggerst
   9.She runs ................... in my class.
       A.the slowest       B.the most slow          C.the slowly        D.the most slowly
   10.My house is .................hers.
       A.cheap than        B.cheaper                   C.more cheap than          D.cheaper than
    11.My office is ..................away than mine. 
       A.father                B.more far                    C.farther           D.farer
    12.Lana is ..................than David.
       A.handsome                                B.the more handsome
      C.more handsome                       D.the most handsome
    13.She did the test......................I did.
      A.as bad as            B.badder than             C.more badly than     D.worse than
    14.A boat is .........................than a plane.
      A.slower                 B.slowest              C.more slow           D.more slower