Questions 19 to 22 are based on the conversation you have just heard.

A．They were able to fly it in the air.
B．They were able to stay up in the air for half an hour and more in the machine.
C．They were able to carry travelers.
D．They were able to fly in around Dayton.

A．They offered him a lot of moral support.
B．They thought it was a good idea.
C．They refused to give him any financial help.
D．Their responses were mostly negative.