（ ）1. Jeff goes to work _______ and his wife goes to work ______ .
A. by car, on her bike B. by a car, on her bike
C. by cars, by bikes D. by his car, by bike
（ ）2. What do you _________ the transportation in your city?
A. think about B. think of C. think over D. think
（ ）3. — _______ does it take you to get to Beijing?
— Twenty hours.
A. How often B. How far C. How many D. How long
