1．________ she was invited to the ball made her very happy.
解析：考查主语从句。从句中不缺少成分，并且句意完整，因此用that。
答案：That
2．Children should be reminded of ________ they should do in public places.
解析：考查宾语从句。句意：应该提醒孩子们在公共场所应该做些什么。所填词引导宾语从句且在从句中作do的宾语，故用what。
答案：what
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