The government ______ air quality in urban areas from levels one to five: excellent, fairly good, slightly polluted, poor and dangerous.

The famous director Li’an failed many times but he eventually _____ to achieve success.

We should take some measures to______ wild animals______.

These plants are watered ＿＿ .

—In early autumn Steve applied for admission to college.He wanted to go ________ but to Cornell University.—Oh, why not Harvard?