24.The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.
| A．puzzled; puzzling; puzzling | B．puzzled; puzzling; puzzled |
| C．puzzling; puzzling; puzzled | D．puzzling; puzzled; puzzling |
–Do you think that we should make preparations for the competition in advance?
-– Exactly. ______.
| A．Actions speak louder than words |
| B．Fight no battle unprepared |
| C．Better late than never |
| D．A good beginning is half done |
-–Mary knows the city quite well.
--She______ well have been there before.
| A．need | B．could | C．should | D．may |
The past two years ______a sharp rise in oil price, which adds to the burden of auto transportation industry.
| A．has witnessed | B．witnessed | C．is witnessing | D．witnesses |
-- How could you be so rude as to walk in here in the middle of my class?
--- _________.
| A．Nothing much | B．Nothing serious |
| C．Never again | D．Never mind |
Not until the stadium of Bird’s nest was completed in the end _______ back to their normal position.
| A．did our hearts got | B．did our hearts get |
| C．our hearts got | D．our hearts did get |