keep

Please keep the door closed to prevent the cold air from coming in.

(Chinese) 请保持关门，以防止冷空气进来。

It is difficult to keep quiet when you are excited.

(Chinese) 兴奋的时候很难保持安静。

You can keep the change; I don't need the extra coins.

(Chinese) 你可以保留零钱；我不需要多余的硬币。

She decided to keep the old letters her grandmother had written.

(Chinese) 她决定保留她祖母写的所有旧信件。