He had his camera ready ____he saw something that would make a good picture.
I really can't understand ______ her like that.
Never before______ so highly successful in his attempts to forecast the weather accurately on a small scale.
The scientists predict that if present trends______, women in 400 years will be 2cm shorter and have healthier hearts.
Bush, before Barack Obama, _______ Brown a similar gift, a leather bomber jacket.
The students _____ busily when Miss Brown went to get a book she ____ in the office.