It’s impolite to point anyone your chopsticks.[ ]

Although ________ after the Civil War, the American blacks still took no important role in the white Americans except as servants and laborers.

There is a lake _______ the park. [ ]

There’s a lot to do. We can’t __________ to waste any time.

Does Yao Ming play______the Houston Rockets ?—Yes , and his team is going to play _____the Lakers next week.[ ]