题目内容
The remote desert area is ______ only by helicopter.
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The researchers are currently ______ the study participants' health and lifestyle to see which factors might influence age-related cognitive changes.
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.
If the students can not support themselves during their study in university, they may ask for a student _______ from the government.
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