方框中所给单词的适当形式填空。(每小题1分，共5分)

spend   weigh   slow   leaf  succeed

小题1:Spring is coming and the             turn green.
小题2:If we walk            , we'll be late for the film.
小题3: --What are they doing? --They are            an elephant.
小题4:He is very happy because he has            in passing the exam.
小题5:Mrs. Smith             three thousand yuan on the gold necklace.