As we all know, Neil Armstrong was _____ astronaut. And he was also _____ US citizen.

More than one doctor_____ involved in the rescue that took place after the earthquake.[ ]

lt seems that you are very busy with your subjects all the time, Sally.—I have to. I have a lot of ______ from the society.

Common people always hold the view the experts say is right

You should have been more patient________that customer；I’m sure that selling him the watch was a possibility.[ ]