We have gathered nearly 100,000 quilts, ___ up to half have gone to the flood-hit areas.

         A. with which           B. in which        C. for which      D. of which

 It's my great honor ______ to give a speech at the opening ceremony.

     A) to invite     B) inviting            C) having invited        D) to be invited

The appearance of Yao Ming and T-Mac has_____ the fans of a sure victory for the Huston Rocket in the coming NBA contest.

A. accused       B. expected       C. convinced          D. persuaded

New mineral resources may be discovered during the forthcoming Antarctic _____.

A. excursion        B. execution             C. extraction     D. expedition

Our teacher makes good use of any time______ he can spare.

A. which         B. that             C. when    D. in which

________ your composition carefully, some spelling mistakes can be avoided.

A. Having checked B. Check              C. If you check   D. To check

Much hard ________ he tried，he flailed to catch up with the first runner.

A. although        B. as                   C. while        D. when

Not until about 2000 BC _______done.

A．were known of the oldest paintings     B．the oldest of known paintings were

C．the oldest known were painting              D．were the oldest known paintings

Only when 1 was fourteen ______the importance of study．

A．I realized   B．did I realize   C．had I realized    D．I had realized

She kept looking behind     to see if she was being followed

    A her    B．herself    C．her own    D．she