spend some money/time on sth.
Kitty spends two hours on her homework every day.
Kitty每天花两个小时做家庭作业。

答案：spend +钱 【on/doing 】sth.

注意：spend sometime on sth.翻译为在某物上花钱.

spend sometime in doing sth.翻译www.souquanme.com为在做某事上花钱.in可以省搜趣网略.

所以填on或者doing 都可以.

【●原创回答，仅供参考●O(∩_∩)O~】

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spend+时间或金钱+（in） doing sth
pay 钱 for sth
cost 钱 sth
It takes sb. 时间 to do sth
help sb. with sth
cotinue to do sth
have a nice time (in) doing sth
enjoy oneself (in) doing sth
have difficulty (in) doing sth
thanks for doing sth
不知对你能否有所帮助