I used to use English a lot and spent an hour each day _____ English books in the library.

Of all the streets in Nanjing, Xinjiekou is ___.

Lucy is a good student. She _____ comes late for class.

I don’t know if his uncle _______ .—I think he _______ if it doesn’t rain.

“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”