The teacher asked his students to leave a space in their exercise books _______.

 A. every a few lines                         B. each a few lines

 C. every few lines                               D. each few lines

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.The teache rfound ____ difficult to decide____ he would take with him to attend the

conference.

  A.it;whom        B.himself;who       C.this;whom      D.that;who

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