PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare

“Whose ruler is it”“It’s ________.”

The chairman suggested that we theplan in the next morning, which suggested that he notfor it.

23．Can you make a sentence to _____ the meaning of the phrase?

I’d rather_______ your telephone number in mynotebook, _______ I will forget it.