_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
Mary’s parents objected to _______ John, who was poor and lazy.
Mary felt herself _______to take action to defend herself.
If you _______ with your classmates, you will surely get the same work done far better.
I have no impression _______ he went home perhaps by bike.
It _______to John that he had left the door unlocked.