Haze (雾霾)appears around us. Let’s do ________ helpful to protect the environment.

I think the doctor is able to care of _____ is the matter with your son . 

 I’ll make ____ easier for you to understand by explaining it again in Chinese.

_______not to be late for the meeting, we arrived forty minutes _______ the required time, but after _____seemed hours of waiting, we were informed the meeting had been canceled. 

I know “time is knowledge”, but I never seem to have enough of ____. So I am working hard to save them.