50．You should be more careful when you c________ the street．

49．Taiwan is the biggest i________ of our country．

48．Give me a piece of p________．I want to write something．

47．It’s good to keep your voice down in p________ places．

根据下列句子中的汉语词义写出所缺单词的正确形式，每空一词。把答案写在题后的横线上。

46．They’re singing to r________ money for children an rural areas．