Water, _____ we cannot live, exists in the form of liquid, gas or solid.
You shouldn't keep silent when________.
Doesn't it ________you as rather strange that he never talks about his family?
Several rounds of air and ground attacks from the allied force left the whole city________.
All the students in our class buried themselves ________studies,________the coming exam.
-Did you watch the football match last night?-No,there was something wrong with my TV and it couldn't __________any programs.