I am a pupil.和It my box.改为复数形式.There is a "h" in word "hour"

I am a pupil.和It my box.改为复数形式.There is a "h" in word "hour" there is a watch in the box改为复数形式 It's a new box.（改为复数形式） There is “only one”book o it is a box.(改为复数形式）帮忙啊! This is a box.改为复数形式 This is my book.(改为复数形式) There is a nice cat in the tree.(改为 把下列句子该形式改为复数形式There is a knife in the box.Our teacher often This is my box.改为诶 复数形式 Is this he book?改病句 Is it a head and There is ( )“u” and ( ) “h” in the word “hour”. A.a a B.an a This is my book.改为复数形式 There is a nice cat in the tree.改为复数形 There is( )"h" in the word "hour",but( )"h"doesn't make a so There is ______ "h" in the word "hour". A.a B.the C.an D.\