_______________many children like sugar, I think they had better try not to eat it too often.

 —_____ did Mr Li finish the work last night?  —At about eleven, I think. 

You should keep working hard ____ you have passed the exam. 

A cat, ______ it is a white one ______ a black one, is considered to be a good cat as long as it can catch mice. 

 —_____is your mother ? —A nurse. She works in a hospital.