Complete the following sentences as required （根据所给要求，完成下列句子）:

【1】I have to finish the extra homework tonight. （改为否定句）

________ ________ to finish the extra home work tonight.

【2】There is plenty of water in the water tank. （对划线部分提问）

________ ________ water is there in the water tank?

【3】Kitty hopes she will be a singer in 20 years' time. （保持句意基本不变）

Kitty hopes ________ ________ a singer in 20 years' time.

【4】a lot of time, spent, practicing， he, every day, playing the piano （连词成句）

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