We must know what we should do and what we should avoid ______a good impression on others in public place.
stones and sticks, they ran into the street and joined in the fighting.
Every Monday morning, students in our school would stand at attention, watching the national flag .
, our class beat theirs in the football match.
It was a pity that the great scientist died his research unfinished.
The first topic at the meeting is that we should treasure the water resource.