根据所描述的内容，选择合适的英语单词。
tomorrow e-friend Australia China US water
1．It’s a kind of liquid, no colour, no taste, we need it in our life. （_____）
2．He or she is your friend, you don’t meet each other, you just send e-mails with him or her. （_____）
3．The capital (首都) of which is Beijing. （_____）
4．The day after today. （_____）
5．The capital of which is Sydney. （_____）
6．The United States of America. （_____）
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