they climbed up the mountain ( ) many people were planting trees,and ( ) a lot of sheep were eatinggrass.第二个空填where求解释!关系副词前可以加连词吗?

hill,they,climbed,the,up (.) hill,they,climbed,the,up（．） F____ they climbed up the top of the mountain. hill,they,climbed,the,up.连词成句, They had a short meeting and began to ( )it when they climbed up the mountains. By the time i——back they——up ten metres.A came.have climbed B came.had climbedC come.have climbed D had come.climbed by the time I came back they had climbed up..by the time I came back they had climbed up ten metres现在完成时的结构不是has/have加动词过去分词么?为什么不用have climbed? 一个英语句子：clarks climbed up the great well then,climbed,they,home,mountain,came,the,and(.)连成一句话 He climbed the tree He climbed up the tree 是不是都对,如果是这个两句话有何区别, 一道英语从句的题； （3）The children climbed up the hill,___ they picnicked.A.on its top B.on the top of itC.on whose topD.on the top of that The children climbed up the hill,________ they picnicked．A.on its top B.on the top of it C.on whose top D.on the top of it To our surprised,the old man climbed up to the top of the mountain then we climbed the ____(at up in)mountain选什么?为什么then we climbed ____(at up in)the mountain To see the sunshine,they climbed up the top of the mountain.中to see是做这个句子的目的状语吗?不是说状语是修饰动词、形容词、副词或全句的,常有副词担任吗? Look!the cat_____from the tree.Yes,it_____the tLook!the cat_____from the tree.Yes,it_____the tree just now.A.is jumping down;climbed up B.is jumping down;is clambing up C.jumps down;was climbed D.jumps down;climbed they climbed up the mountain ( ) many people were planting trees,and ( ) a lot of sheep were eatinggrass.第二个空填where求解释!关系副词前可以加连词吗? We climbed up the hill,()we could see nothing all buildingswhileandforbut选什么啊