—_____chapter in Oxford English often consists of four parts.—That’s right.And this chapter mainly talks about _____environmental problems.
----_______is your sister? ---She is thirteen years old.
Everyone ______ here now. Let’s ________.
---“Which class are you in ?” ---“ I’m in .”
---_______ does he look? ---He looks strong.
----Hi, Millie. This is my sister, Sandy. ---_________.