He wrote a letter ______ he explains what had happened in the accident.
| A．what | B．which | C．where | D．how |
She may have missed the train, ___________ she won’t arrive for another hour.
| A．in which case | B．in her case | C．in any case | D．in that case |
It was purely ______ chance that the mistake was discovered.
| A．in | B．for | C．by | D．from |
If city noises_______from Increasing, people______ shout to be heard even at the dinner table 20 years from now.
| A．are not kept; will have to | B．are not kept; have to |
| C．do not keep; will have to | D．do not keep; have to |
----Come on, please give me some ideas about the project.
----With so much work filling my mind, I almost ______.
| A．break up | B．break out | C．break down | D．break off |
_______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 |