35She couldn’t have answered the question if she ________ a few books on world history

_____ the teachers in their school ____ about 200 and one fourth of them ____ ____ teachers.

I often chat with my friends on the Internet.— You are so smart! Will you please tell me____?

One day I _____ a newspaper article about the retirement of an English professor at a nearby state college.

Jack can’t concentrate on his study recently． — Yes, that might ____ why he did so badly in the last test．