Our bad living habits will destroy the earth. Only by changing ____ we live can we save the earth.

They were surprised that a child could work out the problem ______ they themselves couldn’t.

The factory was built in a secret place, around _____ were high mountains.

20．It was four o'clock in the afternoon_____he and his grandpa reached the museum in Guanghan, _____an official warmly received them.

17．－I didn't pass the English exam.
－Work hard, _______you'll succeed.

12．I have written down everything that I saw and heard____memories are still fresh.

7．There are signs______a new, different South is coming out of its dark past.

Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.

A warm thought suddenly came to me _______ I might substitute the hero to buy some flowers for his mother’s 60th birthday.
 

—Was it there _______ you were away to answer the phone?
—There is no doubt about it.