Several hours later, with the help of the police, the students managed to escape from the dangerous situation, ______.

ing special about this device—Well, it can ________ between the cancerous and the normal cells under certain conditions.

I live in the house ____ windows face south.

The bell rang and came in Mr.Brown, a book in his handThen the class began

You won the first prize in the English competition.– ____________ I always fail in English tests.