Ted: The science report is so difficult. Did you finish it?
Sam: No, but I make my brother   45.   it for me.
Ted: OMG! How can you do this? Don’t you need to do it by yourself?
Sam: I know. But he’s   46.     than me.
Ted: That doesn’t mean he needs to do it for you.
Sam: Ms. Wang said we must   47.      it next Monday.
Ted: Yes, but you should do it on your own.
Sam: I will. Perhaps I should watch him   48.      it and
learn from him. And perhaps next time, I will be able
 to do it on my own. Isn’t it great?
Ted: That’s right. Now you get the point.

【題組】45.
(A) doing
(B) to do
(C) does
(D) do