问答题 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. （）