when I bought this watch ,I was given a year's ( ) A.assurance B.insurance C.guarantee D.safety该选哪个?给详细解析,谢谢～

用以下英语单词组成句子1 ：wonder, I ,he, how, such, say, dare, thing.2 :is ,question, when, he, new, bike, bought, this.3 :that, his, you, suggestion, go, home, should, right, is .4 :how, decorate, the, I, house, a, question, remians.5 :w 英语填空题还有3道选择题（1）This is the best film_.A.that I have ever seen B.which I have ever seen C.that he bought D.which I will see (2)This is the book_last week.A.that he bought it B.which he bought it C.that he bought D.when he bou I bought you this book?对this book提问 I don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.boughtI don’t remember when and where I ____ this umbrella.A.buy B.have bought C.will buy D.bought为什么选D? i had to take out insurance when i bought the when I bought this watch ,I was given a year's ( ) A.assurance B.insurance C.guarantee D.safety该选哪个?给详细解析,谢谢～ This is the first mobile phone ()I boughtThis is the first mobile phone _____ I bought.A.which.B.that.C.when.D.who I like all kinds of chocolate ,especially bitter chocolate ,so when mother had bought one,I couldnthelp thinking about _____A him B her C it D this 英语翻译This is what it looks like when I bought.是不是这样？（或者，这是我刚买时看起来的样子） When have you bought the book?Two weeks ago.I have bought it for two weeks. I don’t remember when and where I ____ this umbrella. A. buy B. have bought C. will buy D. boughtI don’t remember when and where I ____ this umbrella. A. buy B. have bought C. will buy D. bough I （like） these books very much.when were they（ bought）为什么可以这样填空?为什么是“when were they（ bought）”而不是“when did they bought? This is the book that I bought it yesterday.改错 this is the book which i bought yesterday This is the bike ___ I bought last week填空 This is _____ new dress I bought yesterday. i bought this pair of trousers two days（ ）. you/book/this/I/bought/.该怎么组合