I could hardly understand ______ in class, so I raised my hand to ask.
— Mary, whose photo is it?—It ______ be Lu’s. Those are her parents.
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.