1.You must learn to____your work.(prior)
2.Some athletes take drugs to improve their____.（perform)
3.Exercise has become part of my____routine.(day)
4.Rebecca always_____in languages at school.(excellence)
5.The letters have been placed in_____piles.(organize)
6.The peace____was welcomed by both sides.(initiate)
7.This problem calls for prompt_____from the government.(act)
8.The virus attacks______cells in the brain.(specify)