--- Who’s singing in the bathroom?--- It ________ be Mr. Brown. Nobody sings like that except him.
Betty’s brother isn’t old enough to look after ____.
— Why must I wear my school uniform, mom? — Because you are a student. You are _________ to wear your own clothes to school.
— Helen, your English is pretty good. How can I improve my English? —I think you can improve your English ______ reading more.
Super Junior is ________ great group. I really like their songs and dances.
Liu Xiang runs ________ fast ________ no one can catch up with him.