Review the following sentences as required（根据所给要求，改写下列句子。每空格限填一词）
Uncle Li used to go fishing in a small pond. (改为否定句)
Uncle Li to go fishing in a small pond.
The government has made some plans to improve our world. (改为被动语态)
Some plans made to improve our world by the government.
His mother cooked very delicious dishes for us. (改感叹句)
dishes his mother cooked for us!
Grandma will finish the sweater in three days. (对划线部分提问)
will Grandma finish the sweater?
The water is polluted so seriously that we can't drink it. (保持句意不变)
The water is polluted _________seriously for us _________drink.
Could you tell me how I should take the medicine?（改简单句）
Could you tell me take the medicine?