—Look！He's running so fast!
—Hard to ________ his legs were once broken.
| A．know | B．imagine |
| C．realize | D．find |
－It’s many years since I saw you last, I __________ you at all.
－I wouldn’t have, either, if someone __________ you by the name.
| A．didn’t recognize; hadn’t called | B．didn’t recognize; didn’t call |
| C．haven’t recognized; didn’t call | D．can’t recognize; had called |
When he looked up, he suddenly found himselfby a group of teenagers,
| A．to be surrounded; | B．surrounded; |
| C．be surrounded; | D．having been surrounded; |
I really don’t know _________ I had my money stolen.
| A．when was it that | B．that it was when |
| C．where it was that | D．it was where that |
_________ the problem of land erosion getting more serious, the government is searching for a way to deal with it.
| A．As | B．With | C．When | D．Because |
－Mom’s gift? She _______ have chosen a better one for me.
－She must be very happy to know it.
| A．should | B．might | C．couldn’t | D．mustn’t |