It was so bright outdoors that we could see clearly what was happening through the curtains ________ before the window. 

Lily’s mobile phone was left in a taxi accidentally, never ______ again.

The ______ news made all of us ______ to death.

 Ladies and gentlemen, please remain ________ until the plane has come to a complete stop.

 _______ in 1636, Harvard is one of the most famous universities in the United States.