_____is the population of Shanghai? 

—Can you imagine ____________the Taiwan HEDP(塑化剂) event will affect our life?—I’m not sure. Many people have begun to have water instead of drinks.

I saw him crossing the street. The sentence structure is _______.

— _________ do you have an Art Festival in your school?   — Once a year.

— ______ his bike is lost? — He has to go to school on foot.