The author argues that the cause of the disaster was
A．a careless worker with a cigarette
B．the poor telephone system in the factory
C．the slow response by the fire department
D．the lack of fire safety measures

The question "How do you feel？" seems to be suitable when asked of ______.
A．a man walking in the street
B．a friend who has fallen ill
C．a person having lost a close friend
D．a stranger who looks worried

Why does the author mention the fire extinguisher hose in paragraph 2？
A．To emphasize the unsafe working conditions
B．To show the manager's leadership skills
C．To illustrate the factory's modem technology
D．To explain how the fire was eventually put out

The tree was cut ______.
A．down
B．in
C．off
D．out

If you want to change to a double room you'll have to pay __ 50 Yuan.
A．an extra
B．other
C．more
D．each

They look so much like each other that you can't tell which is ______.
A．who
B．whom
C．which
D．that