_________side of the street is lied with different shops, _________of which sell electronic products.

Of the equipment we have produced, this sells best, for it has the advantage over ________ of working efficiently.     

Doctors should take special care when treating children because their breathing rate is different from _____ of adults.

—Our government is doing _______ to protect the environment.—That’s great. 

—I can’t find my e-dictionary. —I saw Mary going with ________. However, I am not certain if it is yours.