He started to learn English in 1990 and in the years ________ he kept on using it in his work.
Lin Feng is said __________ abroad, but I don't know which country he studied in.
The engine just won't start. Something seems __________ wrong with it.
When he came in, I happened __________ my experiment in the lab.
Now I've got him in my __________;I can make him do anything I want.
The doctor thought __________ would be good for you to have a holiday.