【B3】
A. isn't
B. are
C. aren't
The tower was built ______.
A. to guard the city
B. for the people to see the sea
C. as a church bell tower
The two ends of a tunnel are very wide.
A. Right.
B. Wrong.
C. Doesn't say.
Why does it lean?
A. Because it was built as a lean tower.
Because it was built on soft ground.
C. We don't know.