定语从句,帮忙解答,快!谢谢!1.the Second World War ___________milllions O

定语从句,帮忙解答,快!谢谢!
1.the Second World War ___________milllions Of people were killded ended in 1945.
Aon which B where C in that D during
2.winter is the time of year____the days are short and nights are long
Aon which Bthat Cwhen Dwhere
7.He built a telescope_____he could study the skies.
A.by it B through which Cwith that Dthat
8.Cruseoe''sdog became ill and died ,____made him very lonely
Athis Bthat Cwhich Das