根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。

1.  There is a long water s_____  in the Water World.

2.  The vegetables at the m______are cheaper than those at the supermarket.

3.  I kept waiting for my girlfriend for two hours but she didn't______up.

4.  All the s______in the restaurant are very kind and helpful.

5.  The boy jumped up and down like a c______. Everyone laughed.