The place _______ the bridge is supposed to be built should be________the cross-river traffic is the heaviest.

Boys_________ model planes to dolls, while girls _________ have dolls than model planes.

What’s the matter with the man hanging his headthere—Well，if you ________ know, hewas caught stealing my bike.

Look! Someone has broken the coffee cup! —Well, it ______ me

__about her son’s future, the mother has beensleeping very badly these months.