Did you see Mary and her sister this morning?– Yes, I saw _________ girls playing in the playground.

I could hardly understand ______ in class, so I raised my hand to ask.

We must be strict ______ ourselvesand ______ our work. [ ]

China has produced many great writers over the last ten years, Mo Yan.

If there is a will, there is a way to get the trouble ______.