21£®They want to know        do to help us.

      A£®what can they                     B£®how they can

      C£®what they can                     D£®how can they

22£®My sister met him at the cinema yesterday afternoon, so he      

your lecture.

      A£®shouldn’t have attended        B£®needn’t have attended

      C£®mustn’t have attended           D£®couldn’t have attended