My sister is four. My ______ brother is five years ______ than I. He is ______ of us three.
The students should wear school uniforms when they’re at school.
Mr. Green is very happy because he is satisfied with his students’ work today.
—What about having a drink? — .
—Mum, summer holiday is coming. I wonder . —How about Qinling Wild Zoo?
—It’s our duty ________our city clean and beautiful. —Yes. We should do something for it.