★★★
  on one's best
盡...之全力,最好的表現
 
 
The students were on their best behaviour when the principal
visited.

當校長來視察時,這些學生都盡全力表現出最好的一面。
He promised to be on his best behaviour.
他承諾將盡他的全力表現守規矩。

dedicate
best performance
devote

建議使用最佳瀏覽解析度﹕IE 5.0 以上版本 800 x 600