Who was the first________(reach)?为什么用to reach?不用reaching?

I am the first___(arrive)here说明原因 who was the The Chinese were the first___(use)paper money.为什么要填不定式to use? who was the ____of the high jump 求助几道英语题目（定语从句）1.I will never forget the days _______ we spent together.A.which B.when C.where D.whose2.I was given these books on cooking,the first___ I really enjoyed.A.of that B.of which C.that D.which3.---Do you have an by who was the book written Who was that on the phone?翻译 Who was the father of modern China? who was playing with the ribbon? Who was the first premier of RPC? who i was the aurora borealis. who was the best performer是什么意思 who was Apollo in the Greek myths? who was Apollo in the Greek myths i was't the one who was chosen. who was who was the president during the american civil war Who was the president during the American Civil War?