当约翰步行去学校时,他在一棵树上看见一只猫。When John________ ________to school,he saw a cat________a tree.
Boys and girls, please stand in a (直的) line.
You must know how to behave (合适地) at this important party.
Jim managed to (逃离) from the burning car.
The (引进) of the Internet has greatly changed our village.
Drums are (基础的) to African music. People there play them often.