— Was the problem solved at the meeting? — Not yet I’m afraid it may lead to more serious ones if _____ unsolved[ ]

Whether the wounded ________ sent to the hospital _______ unknown

It was not immediately obvious _____ water was to be fundamental to the development of life

, almost every possible means ______to provide accommodation and medical rescue for the people in the flood-stricken area.

By the time Jack returned home from England，his son ________ from college.(2011·辽宁)