This is a very interesting storybook .此句话主语是什么.怎么判断一个句子的主语.隐形主语又是怎么一回事情?HELP!

Collect leaves is very inter esting? Tom loves swimming because it is very interesting 对because it is very inter This is a very p_____ trip. This is a very busy semester. this -----is very interesting. This is a ( ) boy.A a very good B a good very C very a good D very good a the a() of this book is a very young girl INTER Inter This is a very interesting story.(同义句转换) this is a very beautiful dress 改成感叹句 This is a very interesting zoo.改为感叹句 This is a very _(success) action movie This is a very strange thing which happened only yesterday this problem is very easy A----- can do it This is a very exciting plan.（改为感叹句） This is a very intersting movie(改为感叹句） This old dish is in a very fragile condition.mean?