根据句子意思，用括号中所给单词的适当形式填空。
1. Don't spend too much time _________ (chat) on the Internet. It's bad for you.
2. Suzhou is one of the most beautiful _________ (city) in China.
3. My shoes are here. Where are _________ (you), Sam?
4. We should know how _________ (achieve) a balance between work and play.
5. He thought it was _________ (hope) to win the award. He gave it up.
6. It's easy to get _________ (lose) in such a big city.
