He started to learn English in 1990 and in the years ________ he kept on using it in his work.
George always does his best, and that’s ______ I like about him.
The staff are excited that they have succeeded in what they ____ to do three months ago.
--- How’s everything going?--- _______________.
When the exciting news eventually came, the girl______ her feelings and burst into tears.
Not until all the fish die in the river ____ how serious the pollution was.