我不知道是谁在敲门。
I didn’t know who was________ ________ ________ ________．
青少年们应该学会对自己的行为负责。
Teenagers should learn to be ________ ________ their behaviors.
我们可以把需要学习的内容与感兴趣的东西联系起来。
We can ________ what we need to learn ________ what we are interested in.
Nowadays, many schools encourage students to ________ to let them understand where foods come from. （种菜）
Teachers ________ their students in order to help them make great progress. （对……严格）
On February 6, China women’s soccer team won the Asian Cup because they didn’t ________ when they were 0-2 behind. （放弃）