do是及物动词，一定要跟宾语的，意思是他不知道要做什么，所以用what提问do的宾语名词。
如果是用how的话，how不能用来提问宾语，所以必须是在do后面有名词的情况下使用.
1.I have not found my new bike yet; and now,I'm not sure ___
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