The old man told the little boy that the sun in the east and sets in the west.
It is dangerous ____ you ______ a close look at the tiger in the zoo.
Take the paper with you. The details we ought to pay attention to ________ on it already.
This problem worried her so much that she didn’t know ___________ with it..
It _______ ten years since my sister ______ an English teacher.
Could you tell us _____ you are getting on well with your classmates?