这是个难题！不是所有的学生都知道如何解决它。
This question is difficult! ____ ____ the students know how to solve it.

——简，这是你的伞么？
——不是我的。今天早上我没带伞。
—Jane, is this your umbrella?
—No, it’s not mine. I didn’t take ____ this morning.

—What would you like, tea or coffee?
—     , thanks. I just prefer a glass of water.

Oh, you want a pen? OK, I’ll get        now.

Lucy and I are classmates. We         in Class One.

Is there         in today’s newspaper?

This is the best way I could think of        him         computer games.

—Which do you like better, skating or skiing?
—       of them. I like running.

I made a call to my parents yesterday, but         of them answered it.

—Which of the two magazines will you take?
—I’ll take       though I find        of them are very useful to me.