C  63. A. had they found    B. should they find       

 C. could they find   D. did they find

A  64. A. content      B. contrary      C. concrete      D. complete

B  65. A. fault     B. mistake      C. error        D. shortage

C  66. A. helpful       B. heavy         C. healthy       D. high

B  67. A. Consequently      B. Finally      C. Lately       D. Fortunately

D  68. A. while          B.  which      C. whenever          D. when

B  69. A. lay     B.  lie      C. laid         C. lain

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