1.She has made it clear _______ she will have nothing to do with him.
A.what B.which C.whether D.that
D 主句与从局部缺少任何成分,故用that 引导（that 不做成分）
2.It is even known to children ______ one plus one is equal to two.
A.that B./ C.how D.and
A.从句结构完整,that不做成分,it是形式主语
3.I really don't know ______ that overhead bridge will be finished.
A.how long B.how far C.how soon D.how often
C.按照句意做.看到“will”,表示将来,故明显用how soon
4.Our class teacher said ______ when to visit the Shanghai Radio and TV Tower hadn't been decided yet.
A.whether B.that C.if D.and
B.同样的道理,从句结构完整,主、谓、宾都在,用that 引导,that 不做成分.
5.What _____ would happen if your mother knew you felt that way?
A.you suppose B.do you suppose C.will you suppose D.you would suppose
B.此处do you suppose ,不做成分,对整个句子没有影响