简答题:根据下面资料，回答51-55题
提示：李明打电话给David，邀请他下星期日去博物馆看展览。
( L = Li Ming；D = David)
L: Hello．This is Li Ming speaking．May I speak to David?
D: 51 What' s up, Li Ming?
L: What are you going to do next Sunday?
D: Nothing much．Do you have any ideas?
L: 52 ?There's a Russian oil painting exhibition there．
D : Good idea ! 53 ?
L: Bus 202 will take you there．
D: Good． 54 , then?
L: Let' s meet just at the gate of the museum．
D: 55 ?
L : Half past nine．
D: All right．See you then．
第（51）题答案