--- I don’t want to ask him for help, for he is a hard man. --- But, in fact, he is _______ glad to help.

We have every reason to believe the print media are usually more      and reliable than Internet.

Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.

Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours. 

There must be ________ with the computer.