Everybody has ______ responsibility to save water, if future generations are to enjoy _____ similar standard of living to the one we enjoy now.
By the time he was 12 years old, he_______ threedifferent languages.
Tom studied very hard, and he wanted _______ to his chance to Learn.
-What is the policewoman doing? -She raises her arm as a(n) _______ for us to stop.
The villagers have ______almost 200,000 yuan to build a school since last winter.
Lucy advised him not to buy the knife, but he bought it _______.