Have you been to the Great Wall? —Perhaps not in my memory. ________, it might have been during my early childhood.

His first novel in 2009.

The principal is not here, and you’d better call him ______ 3 p.m. ______ 5 p.m. tomorrow. [ ]

There ______ lots of bad information which is not ____ for teenagers on the Internet.

What you said just now has ______ the matter we are discussing. Let’s come to the point.