1. In the past few years, we’ve seen works by Chinese sci-fi writers winning international ______.

A. conclusion                           B. standard

C. potential                            D. recognition

2. People believe writing poems provides a      through which they can express their feelings.

A. shelter                              B. source

C. channel                              D. background

3. It came as a great ________ to the parents that their son finally came back safe and sound.

A. relief                               B. sense

C. relaxion                             D. favor

4. Wild swans’ ________ in the area is a good indication of a better environment.

A. exhibition                           B. escape

C. absence                              D. appearance