—How long does it take to get to the airport?

—Forty minutes. But it’s foggy today. I’m not sure ?????? the highway will closes soon. Let’s set off earlier.

A. whether????????????? ????????????? ????????????? B. when????????????? ????????????? ????????????? ????????????? C. how????????????? ????????????? ????????????? D. why

—How long does it take to get to the airport?

—Forty minutes. But it’s foggy today. I’m not sure          the highway will closes soon. Let’s set off earlier.

A．whether          B．when             C．how              D．why

----How long does it take us to go to your hometown from here?

  ----It takes us      hour or more to go to my hometown by        train.

  A. an; a    B. a ; an    C. an; /    D. a; /