A.Would; put forward | B.Should; call off |
C.Will; give up | D.Should; put up |
A.a subject so difficult as | B.as a subject difficult as |
C.as difficult a subject as | D.difficult as subject as |
A.how was it that | B.how it was that |
C.how was it | D.how was that |
A.on | B.by | C.across | D.off |
A.the; | B.the; the | C.an; the | D.an; |
A.needn"t; mustn"t | B.can"t; won"t |
C.mustn"t; mustn"t | D.may not; needn"t |
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