The computer is ________ to be one of the greatest inventions of the 20th century.
Mary ______ all the housework, she dropped herself into the sofa, sighing with relief.
Scientists say human activity contributes to climate change, but they do not agree on the rate_______ climate change may be developing.
Everybody has ______ responsibility to save water, if future generations are to enjoy _____ similar standard of living to the one we enjoy now.
______ the new life in Qingdao, the old man lived happily with his son after leaving his home in the countryside.
-- So what is the procedure? --- All the applicants ______ before a final decision is made by the authority.