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1£®Water is ________ (±Ø²»¿ÉÉÙµÄ) to keep every living thing alive.

2£®Knowledge has become a ________ (¹Ø¼üÐÔµÄ) factor in the progress of a country.

3£®He had no ________ (¿Í¹ÛµÄ) evidence that anything extraordinary was happening.

4£®It is widely ________ (³ÐÈÏ) that students should be evaluated in terms of overall quality.

5£®As a matter of fact, happiness doesn't lie in how much ________ (²Æ²ú) you own.

6£®Data are analyzed, and results are ________ (ÆÀ¹À) and shared with other investigators.

7£®Scientists have ________ (»ñµÃ) more evidence that plastic is finding its way into the human body.