We noticed that each animal and each tree in the park _____ being taken good care of.
— Don’t worry, Mum. The doctor said it was only the flu.—____! I’ll tell Dad there’s nothing serious.
All flights ____ because of the snowstorm, many passengers could do nothing but take the train.
As he works in a remote area, he visits his parents only ____.
It was the training ____ he had as a young man ____ made him such a good engineer.
Nobody but doctors or nurses and those____ by Dr.Hu ____ to enter the patient’s room.