题目内容：

1.Molly was singing at that time．（改为一般疑问旬）

________ Molly ________ at that time？

2.The Greens have worked in China for four years．（对划线部分提问）

________ ________ have the Greens worked?

3.Last year．we planted 110 trees．（改为现在完成时）

So far，we ________ ________ 110 trees．

4.Mary has learnt Italian before．（改为否定句）

Mary ________ ________ Italian before．

5.Mr. Smith has few friends，________ ________？（完成反意疑问句）