根据句意完成句子。

1. Smoke from those big factories is __________ (harm) to the villagers nearby.

2. When the fire happened, the firemen hurried there and carried the children to ________ (safe).

3. It is well _________ (know) that the Beijing Olympics in 2008 was a great success.

4. His fans rushed towards him _________ (short) after the match.

5. To keep a lamp _________ (burn), we have to keep putting oil in it.