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21£®The Olympics are such great ____ that people all over the world take part in them.

       A£®things               B£®events               C£®matters             D£®affairs

22£®. —What are you busy doing now?  

       —_____.

       A£®to prepare the exams I’ll take.             B£®preparing the exams I’ll take.

       C£®to prepare for the exam I’ll take          D£®preparing for the exams I’ll take.