Water, which seems so simple and common, is _____ makes life possible.
Someone who lacks staying power and perseverance is unlikely to ________a good researcher.
She was in a poor ________ of health,which worries her mother a lot.
There are plenty of jobs ________ in the western part of the country.
What the scientist said sounded strange;________,they made sense.
Though the man was badly hurt in the accident,he was still________ and could think clearly.