The fans were well behaved,and the game was played without _________.

Such men have made＿＿＿＿＿by developing oil businesses．

As second-hand smoking is more harmful and dangerous, people want a total _____against smoking in public．

It is the           in this country to go out and pick flowers on the first day of the spring.

—Do I need to give a tip if I eat at a fast food restaurant in the United States?—Yes , it’s a common       to tip waiters in a restaurant.