Water,which seems so simple and common,is___make lifes possible
When __________, the museum will be open to the public next year.
The research is so designed that once __________ nothing can be done to change it.
__________ more attention, the trees could have grown better.
__________ many times, he finally understood it.
(2009·江西) __________ the right kind of training, these teenage soccer players may one day grew the international stars.