Do you know David well——Sure. Wefriendssince ten years ago.

.Not all the students sitting in the back row can seethe words on the blackboard _________.

he Yangtze River is _______ home to adiverse range of fish and animals including the white-flag dolphin, a rare animal.

He is much better and can now.

Thank goodness, you’re here! What ______ you? — Traffic jam.