请根据句意及汉语提示,写出所缺单词。 小题1:________ (叶子) will turn green when spring comes. 小题2:I ________ (想知道) why he is late for school again. 小题3: I wrote a letter to him two days ago, but he didn’t ________ (回复) to me. 小题4: He often ________ (跟随) me up the hill. 小题5:—Do they like eating ________ (三明治)? —No, they don’t.