--Why does the lake smell terrible?    ---Because large quantities of water ______.

While building a tunnel through the mountain, _______.

--Will there       a football match on CCTV 5 this evening?--Yes. There         usually football matches on Sunday evenings.

 The writer and professor, whom I often refer to at the meetings, ____ famous for those works. 

I want to know all negative effects the Internet           our lives.