How this happened is still a question是否可换成it is still a ques

It is a question how he did it.是甚么从句?How he did it is a ques how to do it well is still a_(problem/question) 71.It is still a question __we shall have our sports meet. It is still a question ________when we shall have our sports It is still a question where the coming show will be held?wh It is still a question _______ we shall have our sports meet 13.It is still a question ( )we shall have our sports meet. It is still a question when we shall have our sports meet为什么 It is still a mystery for 翻译：Be or not to be is still a question . Life is Still a struggle,Still gotta How is your mother?She is still a ittle w____