you should make it a rule to leave things __ you can find th

you should make it a rule to leave things __ you can find them again.1.when2.where 3.then 4.there
please tell me __they will come 1.whose 2.where 3.whether两题;答案(为什么选);解释(为什么不选)翻译

答案是there 你应该分类把东西放在你下次能找到的地方. 从句子意思看,when,then不对.
而leave sth to some place 所以应该用to where 而不是where
但there前面是介词要省略的,故用there.
答案是whether,请告诉我他们是否回来.
不能选whose（谁的)主句和从句都已经有主语了,所以不能用whose.
如果选where的话,同上题,where前面是缺to的,因为从句还原是they will come to where.
所以只能选whether啦.