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

--- ____homework is required for a middle school student every day ?          ---About two hours .                                            

—________ girls are there in you r classroom?  —There’re thirty-one. 

My life has changed a lot during the ____________ years.    

--- What do you think of the fish?    --- It looks __________,but tastes__________.