Asia is______the largest continent in the world.
— Did Mike call ______you yesterday?— No, but this morning he called _______my office.
It is such a modem machine ____few of the workers know how to operate it.
_____ in bed, we listened to the heavy rain _______ the window.
Is_____ necessary ____them to stop ________ every two hours?
_______ my opinion, that job is for a girl of ten.