It is believed that _____ European scientist invented _______.
An expert was _____ to give a speech on how to learn English well.
Scientists have made a major ____ in cancer research.
His success _______ his hard work.
He slipped and had his leg broken. _______, he will have to be away from school for two or three months.
It will make no difference whether our pay will be _______ 5% this year.