This is _____ eraser and that’s _____ gold(黄金) ring.

－Have you written anything on Chinese traditional food so far －_________, but I have a plan for it.

Xun were a contemporary writer, I can’tguarantee that he ________ laughed at by readers, as most young people don’tappreciate his writing style.

Mr. Johns ______ a better plan than the one now under consideration.

I don’t know _________ the problem.