21. Every morning, the fish mongers stood there ______ with the fishermen for fishes.

______ the working efficiency,the boss allows the employees to have a coffee break. [ ]

With car prices _____, I find it difficult to realize my dream of having a car of my own.

periment shows that proper amounts ofexercise, if __ regularly, can improve our health.

Can I borrow this novel —Sorry Only teachers and students inour school enjoy the ______