题目内容
The researchers are currently ______ the study participants' health and lifestyle to see which factors might influence age-related cognitive changes.
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It was difficult to ______ how many people had been wounded in the earthquake.
Over the past years, China has made great ______ to creating an international environment of peace and stability for global economic and social development.
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The next time I buy a typewriter, I’m going to buy a _______ model.
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