Students should pay attention to __________ the teacher in class.
— Everyone knows Canada is the second _______ country in the world.— That is, it is larger than _______ country in Asia.
— Excuse me, _______ is it from here to the World Park?— About half an hour by underground.
Amy is glad to help others _______, so we often ask her for help.
We can choose any book _______ in the library _______ the Reading Week.
You should trust the boy because he _______ lies.