1．________ she was invited to the ball made her very happy．
答案：That 空格处引导主语从句。从句中不缺少成分，并且句意完整，因此用that引导该主语从句。
2．Children should be reminded of ________ they should do in public places．
答案：what 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，意为“……的事情”，故用what。
3．Dick enjoys painting but he knows the fact ________ he doesn't have what it takes to be a professional．
答案：that 句意：迪克喜欢画画，但他知道自己没有成为一名专业画家所需要的(素质)。that引导同位语从句，说明fact的具体内容。
4．Success partially depends on ________ you have the patience to do simple things perfectly．
答案：whether 根据句子结构可知，设空处引导宾语从句；根据句意可判断，设空处意为“是否”，其前有介词on，故填 whether。
5．I lost my cell phone yesterday． Can you tell me ________ I can buy one?
答案：where where引导宾语从句，且在从句中作地点状语。
