I think it is necessary for my 19-year-old son to have his own mobile phone, for I sometimes want to make sure if he _____ home for dinner.
He made another wonderful discovery, ______ of great importance to science.
Was it through Mary, _____ was working at a high school, ____ you got to know Tom?
Every time Ashtita tries to break a record, he reaches a point ______ he feels he cannot physically do any more.
The boy talked his mother ________ buying him a home computer.
When ______ about the secret of his success, Steven Spielberg said that he owes much of his success and happiness ________ his wife and children.