As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.
That is the first time that I _____ at the meeting.
The number of people invited _______ one hundred, but only a small number of people ____ come.
We advised him __________________
He asked _____________ for the piano.
There are a great number of words in the English language ______________ on colors. A. based B. base C basing D. is based