—______ do you write to your pen friend?—Once a week.A. How long B. How soon C. How often
of four buses will take you to the station . We can take of them .
It’s time since we met last .
In order to let more people pay attention to their plan, they _________ some signs on the wall.
—Look out! Don’t run the red light when crossing the road next time. —_______________.
To solve the traffic problem, more and more bridges ____________ across the river every year.