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

A．Because her friend asked her to buy one.
B．Because she wanted to buy one.
C．Because she wanted to give it as a gift to her friend.
D．Because she wanted to apologize to her friend.

A．Make long road or rail tunnels safer.
B．Make long road or rail tunnels easier.
C．Make long road or rail tunnels quicker.
D．Make long road or rail tunnels more efficient.