按要求改写句子。(18分)
（1）My brother is making__a__sandcastle．(就画线部分提问)
________ ________ ________brother ________？
（2）It is warm in summer.(就画线部分提问)
________ the ________ ________ in summer?
（3）It is spring in China.(就画线部分提问)
________ ________is it in China?