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21£®--- I’ve got your invitation.

    --- Oh, good.              .

       A£®Can you come?                                   B£®Thanks a lot.

       C£®I’ll take it.                                           D£®May I help you?

22£®A good storyteller must be able to hold his listeners’ curiosity         he reaches the end of the story.

       A£®when                  B£®unless                 C£®after                   D£®until