Heconcludedhisspeechwitharemarkthatfailure____themotherofsuccess.
B
【句意】本期设计联络会将持续十天才会结束。
【难点】by the time意指no later than the moment that something happens，常与过去完成时和将来完成时连用。
As the pressure____, the liquid rock is forced up through channels in the resistant rock to the earth’s surface.
Theoldmanlivesinavillage_______,butheneverfeels________.
He concluded his speech with a remark that failure ____the mother of success.