The Big Ben, _______ we visited during a recent trip to Britain, is one of London’s tourist attractions.
The discovery of new evidence led to ________.
—How much farther shall we have to go? —Another five miles until we reach the mountain _______.
On yesterday interview, he didn’t make a(n)_________at all; what’s the matter with him?
I think I was at school, ______I was staying with a friend during the vacation when I heard the news.
There were two boys in the lab, ________ did the experiment successfully.