—What did you do last weekend?—Oh,nothing________.
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.
The boy entered the room quietly in order to avoid __________ his parents.