It was playing computer games that cost the boy plenty of time that he ______ spent doing his lessons.

    A. might have                   B. should

    C. ought to have                    D. could

The bridge ____ in the 1800's was the oldest building in this village.

    A. to be completed              B. having been completed

    C. completed                    D. being completed

Please remind me in case I ______ forget.

    A. could                            B. would

    C. should                       D. will

He is always ready to help others. That's one of his _____.

    A. strengths                        B. powers

    C. abilities                        D. benefits

It is not expected ____ he said caused so much discussion at the meeting.

    A. that                         B. what that

    C. what                         D. that what

The chairman thought ____ necessary to invite Professor Smith to speak at the meeting.

    A. that                         B. it

    C. this                         D. him

____ we are alone, we can speak freely.

    A. Now that                     B. Though

    C. Even if                      D. As if

Shall we go ____ downtown to buy some clothes of high quality?

    A. to                           B. the

    C. 不填                         D. to a

Nobody believed his reason for being absent from the class __________he had to meet his uncle at the airport.?

    A. why                          B. that        

    C. where                        D. because?

More consumers are waiting for the further drop of housing prices with money in their hands rather than ______ houses, according to a report.

    A. to buy                       B. buying

    C. buy                          D. bought