He came back for the book which he had forgotten这句对吗?which能换成that吗?都能省略吗?

he came back to his hometown for the p----of seeing his parents He came back for the book .什么用意?顺便介绍一下 for 的用法..谢谢大虾们. He came back o____ the evening of June1st. I. came. back. ( ). the. when he came back to He came back for the book which he had forgotten这句对吗?which能换成that吗?都能省略吗? 1.It was ________that I had to wait for him in my study last night and went to bed.A.not until he came backB.when he came back C.until he came backD.after he came back2.We haven't settled the question of ______it is necesary for him to study abroad.A When he came back he found his house was crowded with friends ...下列选择哪一项?When he came back he found his house was crowded with friends eager to congratulate him on his ( )A been chosen for the expedition B having been chosen for the exp by the time you came back,we (complete)the work by the time he comes back,we (complete)the workby the time you came back，we (complete)the workby the time he comes back,(complete)the work He said that he ___give her the present as soon as she came back. he came back home he turned on the tv用as soon as 连接 he came to hold a talk about the xx for To our -----,he safely came back to the earth with the crew(exciting) the owner went into a room at the back ,took some things out and came back to he he,back,china,to,then,came 排列 came,he,china,back,yesterday,to 排列 we left after he came back home Has he come back?对么?不用came?