It ____him half an hour to do his homework every day.
We didn’t go to the concert because we couldn’t to buy the tickets to it.
It is sunny outside. Why not ________ the light and open the window?
A report says that the world’s natural gas deposits (储存) ________ early in the next century.
----- Sir, did you see the sign “ No Parking” ? ----- Sorry. I didn’t know parking here isn’t________.
The car needs checking. It may cause accidents if it _______ soon.