The boots are _____ designed and they can prevent us from _____ in the air.

Don’t you know your computer has been infected with viruses?— Really, no wonder it hasn’t ________ as well as before. [ ]

He is actor and he acted unlucky man in that movie.

Half the world’s population ______ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world’s fresh water supply

What was it that________the terrible accident? —His driving after drinking.