题目内容
Maintaining the health and quality of life of the elderly is a __________ issue for us all.
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Measles, which once killed 450 children each year and disabled even more, was nearly wiped out in the united states 14 years ago by the __________ use of the MMR vaccine.
Millions of wild flowers colour the valleys, __________ in April and May.
Mr. Black gave an excellent speech that __________ expectations.
My father's life work was devoted to the __________ of the wilderness.
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