Every evening after dinner, if not from work, I will spend some time walking my dog.
_____ is known to everybody that the moon travels round the earth.
Was it during the summer vacation ______ he went to Shanghai?
We prefer__________alone rather than__________.
This is my dear teacher without_________help I couldn’t have passed that difficult exam.
Mr. Black _______Shanghai in a few days. Do you know when the earliest plane _______ on Sunday.