―How come I didn’t get the message that we were to have the meeting at 4 pm? ―Well, your phone ________ it．

If they       what I was saying, they'd know what I was talking about

When Marx was in London, he _______ read at the library for hours.

If Greeks and Turks had not helped each other after the earthquakes five years ago,they____ mortal enemies instead of friendly neighbors later on..

We were suggested that we ____ attention to protecting wild animals.