_____ at his knowledge, all the students showed their respect for their teacher.

Apart from the opening and closing ceremonies and some key matches, ticket price will be____to ordinary people.

31. – How did your father catch so many fish?– By using a ________. 

—Do you have any idea why the engineer resigned?—No. In fact, everyone is ____about it.

A government official was murdered in his own house yesterday and the police   are collecting evidence that is ______ to the case.