Annie ______ to the party. She had a wonderful time with us.

Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.

The crowd cheered wildly at the sight of Liu Xiang,who was reported _______ the world record in the

Many boys are in playing computer games.

His father will take him______the museum.[ ]