Riding bikes is a good habit.

骑自行车是一个好习惯。

Wasting food is not a good habit.

浪费食物不是一个好习惯。

To go to bed early is a good habit.

早点睡觉是个好习惯。

Is this a good habit?

这是一个好习惯吗？

It's a good habit to doggie bags in restaurants.

在饭店把没吃完的饭菜打包是个好习惯。