He said that we should protect the ancient civilization from _______.
I know a little bit about the city as I __________ there for one year in my youth.
Leaves are found _______ all kinds of trees, but they differ greatly ________ size and shape.
To save class time, our teacher has ________ students do half of the exercises in class and complete the other half for our homework.
Could you show me the TV set you’d like ________?
Now an increasing number of middle school students go abroad for further study at their own ________, trying hard to realize their dreams.