_______no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

We still don’t know what _________ while we were away from home.

I was born _________ Nanjing _______ a warm spring afternoon. []

What’s the matter with the little boy?—A bad traffic accident happened _____ him. What a pity![ ]

There is a lake _______ the park. [ ]