I’m very ________ about expressing my opinions in public in case I may make mistakes.
Traffic is bad, ______ in the city center during the rush hours.
—What made Alice so upset? —______.
Every Monday morning, students in our school would stand at attention, watching the national flag ______.
Getting out of the crowded bus, ______
______ better in 2010 World Expo is the duty of every citizen in Shanghai.