请随意拿些饼干吃。

Please ___help ___yourself ___to some biscuits.

食物在桌上；请自便。

The food is on the table; just ___help ___yourselves.

在自助餐上，你可以随意取用任何你喜欢的食物。

At the buffet, you can ___help ___yourself ___to whatever you like.