1．Could you tell me ____________ we are going for a picnic this Sunday?
答案：whether/if
2．The problem is ____________ we can make good preparations in such a short time.
答案：whether
3．I don’t know ____________ or not the report is true.
答案：whether
4．The news ____________ he told me is that Tom would go abroad next year.
答案：that/which
5．We believe that there is no doubt ____________ the meeting will be a great success.
答案：that
6．Energy is ____________ makes things work.
答案：what
