For a w （明智的） man，a mistake is a lesson．
When they felt after the flood，the charity offered them food and clothes．（help）
Scientists often that farmers use natural ways to grow fruits．（suggestion）
Our manager greeted the guest with a smile at the entrance．（polite）
For your ，smoking is not allowed during the whole flight．（safe）
Failure isn't always bad．It can teach you lessons．（use）