1. _______ the universe began with the “big bang” has been widely accepted.

A. Whether¡¡¡¡¡¡B. Why¡¡¡¡¡¡C. That¡¡¡¡¡¡D. What

2. It has been proved _______ having a balanced diet helps to keep healthy.

A. if¡¡¡¡¡¡¡¡B. because¡¡¡¡¡¡¡¡C. when¡¡¡¡¡¡¡¡D. that