(2012·安徽) The limits of a person's intelligence, generally speaking, are fixed at birth, but __________ he reaches these limits will depend on his environment.
The conference has been held to discuss the ________of global warming on people’s lives all over the world.
At the railway station,the mother waved goodbye to her daughter until the train was________.
________by a group of children,the old man was delighted.
Learning English means _________ memorizing a huge lot of words.It involves a large amount of reading as well.
Tom as well as two of his classmates _____ invited to the party.