鞋的尺码通常用“码”或“厘米”作单位，它们之间的换算关系是b=2a-10，（b表示码数，a表示厘米数），根据这个关系，小红的爸爸穿40码的皮鞋合______厘米，妈妈穿23.5厘米的皮鞋合______码．

请根据要求改写下列句子，每空一词。

1. We bought some books from the library last week. ( 改为一般疑问句)

    Did you___ ____ ___ _____ books from the library last week?

2. Millie is 1.6 metres tall. Kitty is also 1.6 metres tall. ( 将两句和并成一句)

    Millie is____ _____ tall_____ _____ Kitty.

3. I think this is a good way to keep healthy.( 改为否定句)

    I ___ ____think this___ ____ a good way to keep healthy.

4. It took me two hours to finish my homework yesterday. ( 改为同义句)

    I___________ two hours ___ ____ my homework yesterday.

5. Kate will return to China in a week. (对划线部分提问)

    ______ ______ will Kate return to China?