你知道明天的会议几点开始吗？

Do you ___know what time tomorrow's meeting starts?

你认识住在隔壁的那个人吗？

Do you ___know the person who lives next door?

她知道这个秘密已经很久了。

She has ___known this secret for a long time.

只有经历过失败的人才真正懂得成功的珍贵。

Only those who have ___known failure truly appreciate the value of success.