23. Everybody in the village likes Jack because he is good at telling and _________ jokes. (A) turning up (B) putting up (C) making up (D) showing up

29.They _______ on the program for almost one week before I joined them, and now we________ it as no good results have come out so far. (A) had been working; are still working (B) had worked; were still working (C) have been working; have worked (D) have worked; are still working