---Did you listen to the lecture? ---Yes, I have never heard a ___________ one. 

Young people are not_________ to stand and look at works of art; they want art they can participate in.

He is not ____ to be present at the meeting tonight.

Many doctors complain that they don’t have ______ working hours, for they have to wait for patients all day long in the hospital.

Many rules in English are ______, and large numbers of students feel ______ them.