.Nancy enjoyed herself so much ___ she visited her friends in Sydney last year.

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.

Look, The boys and girls over there.

Hurry up, Mike. You must get to the airport an hour before the plane _______.

What _____ weather! We can’t go boating today.—I’m afraid we have to watch TV at home.