My mother is always warning me when I go out, “Don’t get off the bus ____ it is stopping.”

One should remain ______ and think of ways to escape when facing danger

That hazy（雾霾）weatherhas hit104 citiesin middle-east China lately makes citizens well aware of ______a terrible problem China is faced with.

Today is the Dragon Boat Festival. Let’s watch a boat race.—_________.

I like both of the dresses you bought for me, but_______is suitable for the party.