Charles Darwin considered ______ to be the process by which evolution took place.
Only in this way _________ make progress in our English study.
A cook will be immediately fired if he is found _________ in the kitchen.
_____by one of his fellow soldiers,the wounded man walked slowly across the field.
Jenny worked hard before the final examination,and it_______.She got an A. A.showed off B.paid offC.put off D.took off
All the things __________ must be done well.