Some exercises appear to be ______ ones you have done, but on ______ second thoughts, you’ll find that they’re different.

1. A.
   /; the
2. B.
   the; /
3. C.
   the; a
4. D.
   /; /

Some exercises appear to be ______ ones you have done, but on ______ second thoughts, you’ll find that they’re different.

  A. /; the                B. the; /                     C. the; a                      D. /;

 Some exercises appear to be ______ ones you have done, but on ______ second thoughts, you’ll find that they’re different.

A. /; the     B. the; /           C.the; a      D. /; /

Some exercises appear to be ________ ones you have done, but on ________ second thoughts, you’ll find that they’re different．

     A．不填; the   B．the; the    C．the; 不填        D．不填; 不填