1. That can usually be omitted when it's a conjunction: I know [that] he is happy. 2.
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AnonymousThe speaker doesn't sound like he has serious doubts that the curtain was going to go up.that is optional, but I think most speakers would include it in this case. There is a tendency, I think, to include complementizing that after a noun. (the doubt that ..., a request that ..., the fact that ..., etc.)