6．
从Ⅱ栏中选择适当选项到Ⅰ栏。 (Ⅰ)
If I ride at night,
If you drive a car in Britain,
If I ride to school every day,
If you ride your bicycle in the street,
If everyone obeys the traffic rules,
(Ⅱ)
a. you must be careful enough.
b. I'll keep fit.
c. I should have a bike light or wear light colored clothing.
d. the roads will be safe.
e. you must drive on the left-hand side of the road.
