Tom raised his hands as if ______ something． 

You must follow the directions exactly, and if you should become          you must take the time to back again and read them over.

Mr. Green stood up in defence of the 16-year old boy，_________ that he was not the one ____________.

______the room, a letter was seen lying on the desk.

One winter day ____, he saw the tracks of animals in the snow and observed that the appearance of each one was different.