What would have happened ________, as far as the cliff?
_______ about wild plants that they decided to make a trip to Madagascar for further research.
My father has worked for 20 years in the field of medicine, so he has_______ a huge amount of experience.
My grandfather is always thinking for others. In other words, he is always ____.
_______caused the accident is still a complete mystery.
Mary used to take _______ advantage of the lunch hour to have _______ short sleep in her office.