--Mr.Smith is very strict his students,isn’t he?--Yes,he is.He is strict_ work as well.
As the boy listened attentively in class, everything his teacher said was easily______.
Mary is said _____ in the supermarket for 5 years, but I don’t know why she resigned last month.
______ from the space, you will find the earth is blue.
He was about to go out for a walk _____ his teacher came to visit him.
I will never forget ____ to country village to see the poor children of my age.