In the past, officials have criticized American intelligence services, __________ they relied too heavily on technology.
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.