我不知道是谁在敲门。I didn’t know who was________ ________ ________ ________.
Thanks a lot. Your (友谊) is important to me.
Can you (想象) what you will be like in ten years?
All the students are (划分) into four teams.
Many (visit) came to the hometown of the great man during the vacation.
We are full of energy and (渴望的) for knowledge.