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

_______ comfortably in a chair, he was completely lost in a magazine.

 E-mail, as well as the telephone, _____an important part in daily communication. 

Eating a lot of _____ and vegetables  ______ for your health.

Above one third of the population in Beijing and Shanghai      netizens, but in poorareas, only three or four percent        online.