A.such difficult | B.such a difficult | C.so difficult a | D.so difficult |
A.shameful; ashamed | B.ashamed; shameful |
C.guilty; shameful | D.sorry; shameful |
A.ordinary | B.valuable | C.generous | D.brilliant |
A.creative | B.powerful | C.effective | D.responsible |
A.reasonable | B.probable | C.likely | D.certain |
A.learn | B.learns | C.learnt | D.learning |
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