Public service ads, also PSAs, often _________ for free, _________ to educate people about health, safety or any other problem that affects public welfare.
He bought three books, is in Chinese, in English, and in Japanese.
stop fooling, boys and girls, and he .
Andeison entered the classroom, ____book in ___hand.
She studies ___ medicine before she turned ___ writer.
A non-smoker can hardly imagine__ pleasure of having__ smoke after a meat.