单项选择题
Congress was then in session, and a fierce ______ was going on over ratification of the treaty.
单项选择题 It is not easy to ______ oneself of his bad habits, just as the proverb says, "Old habits die hard".
单项选择题 Difficulties and hardships have ______ the best qualities of the young scientist.
单项选择题 Susan has ______ the elbows of her son’s jacket with leather patches to make it more durable.
