The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
Look! __________.
The suggestion that the president _____ the meeting was accepted.
_____ in 1936, Harvard is one of the most famous universities in the United States.
When you rewrite the paragraph, I advise you to _____ the last sentence as it is rather boring.
He was __with the results of the exam, which can be seen from his look .