1. Is 2. Goes

Direct speech: 1. He said, "Honesty IS the best policy." 2. He said, "Earth GOES around the Sun." Indirect speech: 1. He said THAT honesty WAS the best policy. 2. He said THAT Earth WENT around the Sun. However, in day to day conversation, this is not really a concern.

Whether it is direct or indirect speech, the answer is "Is" and "Goes". It is because both sentences are about time-invariant facts. For such things, the sub-clause's verb stays in the present tense to signify perpetual truth.

1. He said, "Honesty is the best policy." 2. He said, "Earth goes around the Sun." 1.什麼是什麼用"is"，翻譯成中文就能理解了，你下定義的時候不會說什麼東西過去是什麼吧？ 2.地球繞着太陽轉是一個常規形態，不是過去也不是現在繞着太陽，這種情況下用一般進行時 能明白嗎？