The science of medicine,__________progress has been very rapid lately,is perhaps the most important of all the sciences.
It won’t be ______he______ up with others.
— Hi, Tracy, you look tired. I am tired. I_______ the living- room all day.
— 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.