The chemistry teacher required the students _______ more attention _______ the lab clean.
. When the entire class worked together they finished the project _____.
Paper making began in China and from there it _____ to North Africa and Europe.
Children who are over-protected by their parents may become _____.
It would be _____ a risk to let the child go to school by himself.
So far as he could, John had always tried to _____ the example he saw in Lincoln.