It is getting late. I am afraid I must be going now.— Ok. _______.

As we all know, ________ earth moves around ________ sun.

We should consider the students’ request ___the school library provide more books on popular science.

The number of the wild animals is getting smaller and smaller _______people’s activities.

That rude boy ________ have rushed out of the classroom when Ms Green was giving a lecture, which finally led to his being punished by the head teacher.[ ]