There is _____800-meter-long road behind____ hospital.A. an, an B. an, the C. a, the
The task is so hard for e . I don’t know _______________.
Good books help us ___________ a whole new world to me .
There is no air _______ water on the moon .
They don’t know what ___________ the problem .
Don’t try to do everything at once. Take it a bit _______________.