1¡¢____________(pay) for her college education£¬she spent two years working as a cleaner for a rich family in her neighbourhood.

2¡¢Scientists have warned that coral reefs are likely to become the world’s first ecosystem ___________( disappear) because of global warming.

3¡¢The _____________ economy war has affected many industries all over the ___________. (globe)

4¡¢They have been _____________ over the decision. No one can stop their ___________. (argue)

5¡¢Life is _____________, but serving the people is _____________. No one will ___________ you to the service. (limit)