Why didn't you tell me there was no meeting today? I all the way here through the heavy snow.
| A．needn't have driven | B．can't have driven |
| C．mustn't have driven | D．shouldn't have driven |
_______ about wild plants that they decided to make a trip to Madagascar for further research.
| A．So curious the couple was | B．So curious were the couple |
| C．How curious the couple were | D．The couple was such curious |
My father has worked for 20 years in the field of medicine, so he has_______ a huge amount of experience.
| A．achieved | B．piled | C．completed | D．accumulated |
My grandfather is always thinking for others. In other words, he is always ____.
| A．modest | B．cautious | C．considerate | D．considerable |
_______caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
Mary used to take _______ advantage of the lunch hour to have _______ short sleep in her office.
| A．/; the | B．the; the | C．the; a | D．/; a |