The boss has ________to improve the working conditions in the company.

. After many years’ hard work, his career really _____ and he became world famous.

With the help of high technology, more and more new substances ______ in the past 10 years.

He is no longer in good condition, and his ability to work is limited. I ____________ him to give up the job but failed.

Many citizens urged their government to take measures to _______ their carbon emission to reduce greenhouse effects.