.He does nothing but ____all the time . How can he do his work well? A,to have complained B, complains C,complain D,complaining
People who cannot _____ between colours are said to be colour-blind.
When we went past her house, we heard her ____ in her room.
To get there in time, they came ______ all the way.
Finding her car stolen, ___________.
In doing scientific experiments one must be _______ careful with the instruments.