Paul's mother had him ________ because she couldn't bring him up herself.
The warning we were given as children ________ eating fast will make you fat, may in fact, have a scientific explanation.
Although Anne is happy with her success, she wonders ________ will happen to her private life.
________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
We haven't settled the problem of ________ it is necessary for him to study abroad.
It surprised us all ________ Kate made such big progress in this final exam.