1. rather than (be discouraged by / to be discouraged by) this news, take heart in the success of millions of americans who have kicked the habit.

2. quitting smoking is hard, but those who have done it are encouraged by the knowledge (which they conquered / that they conquered) their addiction.

괄호 안의 둘 중에서 어떤 것이 어법상 맞고 왜 맞는 지 알려주세요!