All school buses in the northwestern provinces with satellite positioning devices next year.
| A．fitted | B．will be fitted | C．have been fitted | D．are fitted |
Not until I began to work ________ how much time I had wasted.
| A．didn’t I realize | B．did I realize |
| C．I didn’t realize | D．I realize |
Little ________ about his own safety, though he was in great danger himself.
| A．does he care | B．did he care |
| C．he cares | D．he cared |
Not a single song ________ at yesterday’s party.
| A．she sang | B．sang she |
| C．did she sing | D．she did sing |
Not until all the fish died in the river ________ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．the villagers did realize | D．didn’t the villagers realize |
I finally got the job I dreamed about. Never in all my life ________ so happy!
| A．did I feel | B．I felt |
| C．I had felt | D．had I felt |