We have got accustomed__________ in an air—conditioned room, so we can’t stand the terrible heat outside.
| A．to live | B．to not live | C．to living | D．to not living |
The chairman thought __________ necessary to invite Dr. Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |
This is the first time I __________ to the capital to attend the celebration ceremony.
| A．came | B．come | C．have come | D．had come |
According to a new study by a British university, learning __________ second language can lead to __________ increase in your brain power.
| A．a; the | B．a; an | C．不填; the | D．the; an |
--- Did he break it accidentally?
--- No, __________.
| A．with purpose | B．by chance | C．on purpose | D．by mistake |
--I went to work on foot yesterday, though it was raining cats and dogs.
---You __________ a bus. You were likely to get a cold.
| A．must have taken | B．would take |
| C．could take | D．should have taken |