—Tom is ill. What’s wrong with him? —Poor boy. His illness is the _________ of eating unhealthy food.

Climbing the Great Wall might make you very tired, but it’s a meaningful _________.

–Shall we go out for a walk? –Sorry. This is not the right __ to invite me. I am too tired to walk. 

________表示“联合国” 。

He is an Australian boy. He is from _______.