—Where did you pick up the stamp?—It was at the post office ________ we worked in the summer vacation.
I’m Chinese and I do feel ________ Chinese language is _____most beautiful language. What’s your opinion?
.It _____we had stayed together for a couple of weeks ____I found we had a lot in common.
.In my opinion, life in the twenty-first century is much easier than _______.
.He said he _________ experiments those days.
There was a heavy curtain ________ the light.