It was raining, so I sadly had to cancel our ____

Car exhaust is one of the biggest reasons that cause pollution to our ____

The older ___ speak Taiwanese more often than we do.

Have you ever ____ what will happen to our future?

It's clear that the questions were ___ too easy for the students. The answers came easily.

There wasn't a good ___ why he was late for the class.

It's not ____ for a parent to treat his/her child like that.

We should call the police before the child gets deep-rooted fear.

Please remember to bring your ___ with you before you leave the beach.

It took me a lot of ___ to finish the task. It wasn't very easy.

There are a lot of things on the menu. I can't ___ what to order.

Eating food with ____ ingredients(原料) is healthier for our body.