选择合适的单词，并用其适当形式完成句子。

succeed; success; successful1.

1. I hope you can _____ in the future.

2. She was a _____ basketball player.

3. Everyone wants to know the secret of his _____.

important; importance.

4. Water is very _____ to us, so we should not waste water.

5. He began to realize the _____ of working hard.