let is open our books and turn_____page 89 填介词 为什么是这个介词?

let's open our let is open our books and turn_____page 89 填介词 为什么是这个介词? an open 例如：Your heart was an open book.Your life is an open book. To open a book is always beneficial. To open a book is aways beneficial To open a book is always beneficial. 用have,do,play ,read ,clean ,open,like.填空 1.Look!The boys are __ basketball over there.2.He __ two children,a son and a daughter.3.It is 7:00 now,Mike ___ his homework.4.Do you ___ watching TV?5.John is ___ a book now.6.Let's ___ our room.7.Tom, To open a book is always helpful什么意思 Open our memory book,we had really sweet smile last winter.翻译成英文 Our school library is open seven days a week. an open book open book principle 英语句子填介词can you read lesson2 lesson5?let`s open our books page 89. Let's open our books _____ page 89 .填介词为虾米 These are ____(our)flowers.____(their)are over there.Is this watch ____(your)?No,it's not ____(my).It's____(he)The present is ____(Mum).Let ____(I)open it for ____(she). There isn't such a book in our libraryThere is ______ _______ book in our library Let’ (open) the window Let'stalk about our programme_______ our programme ________our Open Day.A.to B.at C.for D.of