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21£®Rubbish will       light after this kind of new machine is invented.

       A£®be made use of giving                   B£®make use of to give

       C£®make use of giving                        D£®be made use of to give

22£®He insisted that he       an opportunity to try it again.

       A£®gave                       B£®has given                C£®was given              D£®be given