There are over ______ books of all kinds in the library.

Is there _______ in today’s newspaper?— Yes, it’s really cheerful to read that a group of _______ kids joined the volunteers!

It is demanded that the letter ___by the end of this week , dad !—-I’ll do it immediately .

Yesterday I lent a book him.

Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.