Everyone should make a contribution the environment.

What you said just now is out of my depth. This sentence probably means _____.

_____ of them knows Japanese, so I have to ask a third person for help.—You’d better ask Tom for help. He is good at Japanese.

Look! Do you know ______man under the tree? –Sorry .It’s too far to see ______clearly.

I would appreciate _______ you could give me some advice on TOFEL test.