Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2009 to June 2011．

Oetzi, the 5,000 years old “Iceman”, ______on the alpine border between Italy and Austria in 1991.

In our childhood, we were often _______ by Grandma to pay attention to our table manners.

Many a student ______ made that mistake before, which is another way of saying a great many students ________ made that mistake.

 Take care! Don’t drop ink on your shirt, for it _______ easily.