He ____ in the north, but now he ____ here.
| A．used to live; is used to the life |
| B．use to live; is used to live |
| C．used to living; is used to living |
| D．used to live; is used to live |
Entering the room, I found Mary ______at the desk and ______a letter.
| A．Seated；wrote | B．Sitting；written |
| C．Seating；writing | D．Seated；writing |
_________on the main street, the market was busy yesterday.
| A．Located | B．locating | C．being located | D．to be located |
They were surprised that a child should work out the problem _____ they themselves couldn’t.
| A．when | B．where | C．until | D．while |
--- You must obey every word of mine.
--- _____ I don’t?
| A．What if | B．So what | C．How if | D．Only if |
_____ the lecturer more clearly, I arrived early and chose a front seat.
| A．Hear | B．To hear | C．Heard | D．Hearing |