He realized his mistakes and took action to reduce the loss _______ it was too late.
| A．until | B．when | C．before | D．as |
Look! There is a pet dog____on the ground.Let’s go and play with it.
A. lie B. lay C. lying
I don’t know _____
A. where does he come from
B. what is his name
C. how old he is
Money is important in my life. But it isn’t _____ to me.
A. everything B.nothing C.anything
---Which sign can’t be seen on the road? ---_____.
A. 
B. 
C. 
--- Look, the factory is pouring waste water into the river.
--- That’s terrible! Why not _____ them _____ that?
A. keep; doing
B.to keep; to do
C.stop; doing