客车在起步前，应检查行李包是否装捆牢固，长、宽、高及重量是否符合规定，可将行李放置在门道或者过道上。

根据句意及首字母提示，完成单词。

1. People can't live w________ air or water.

2. Please tell your mother to care for h_____ .

3.Tom and Jim are the w_____ of the table tennis game.

4.They s_____ half an hour swimming last night.

5.We must i _____ our environment and make our country more beautiful.