Select the most appropriate meaning of the given idiom.

Ups and downs

Good and bad times

The most appropriate meaning of the idiom "ups and downs" is good and bad times. It refers to the alternating periods of success and failure, happiness and sadness, or prosperity and adversity that are experienced in life. For example, you might say "Life is full of ups and downs."

The other options are incorrect. "Up to the certain standard" means to meet a certain level of quality. "Active in work" means to be busy with work. "A difficult work" is not an idiom.