Knowing their son failed in the exam, the parents stood there, ________.
While _______ out of the window, I saw my father walking the dog in the garden.
Our monitor always comes to our help when we get into trouble _______ she is very busy.
Can you tell me when the plane _______ to Hong Kong this evening?
As neither of the two nations would _______, no agreement was reached that day.
It was because of your attitude to your parents _______ they felt so upset.