28. What was unexpected was that the disrespectable fellow ______ the old man.
The detective, ______ to be reading a newspaper, glanced at the man_____ next to a woman.
Each member country WTO must ___________ its laws and regulations and compete on the principle of fairness and cooperation.
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.