The teachers and parents all agree that teenagers should by all means _______ their studies though there are a lot of attractions around them.

A．devote to         B． fix on         C．concentrate on         D．keep on

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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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