This book gives a brief ________ of MoYan’s growth and details of his writing experiences.

At the meeting they discussed three different ______ to the study of maths.

Before the final examination,many students have shown      of tension.Some have trouble in sleeping while others have lost their appetite(胃口).

As a doctor , it’s against my ______ to accept gifts from patients. 

We should bear in mind that social development and balance of nature should go  in         .