请根据对话内容,用恰当的单词补全对话

请根据对话内容,用恰当的单词补全对话
A:John,I heard you went swimming yesterday.
①______________________was it?
B:It was boring.
A:Really?What ②____________________?
B:Nothing.
A:Nothing?What do you ③________________?
B:The water in the swimming pool there was very dirty.We couldn't swim in it.
A:It seems that water pollution has been a serious problem.
B:Yeah .Then we went to the park nearby,but there was rubbish everywhere.
A:What a ④________________!
B:I think we should do ⑤________________to protect our environment.
A:How about writing a letter about the problems to the TV station?
B:Good idea!