根据下列句子及所给汉语注释或通过上下文, 在答题卡上标有题号的横线上, 写出空缺处各单词的正确形式。每空只写一词。
（1）、Mike is playing near a river. (突然)his ball falls into the water.
（2）、It's dangerous for the kid to go （穿过）the bridge alone.
（3）、What is he (准备) for the picnic?
（4）、The clothes here are those . （邮递员）
（5）、How (幸运的) you are to win the match!
