用所给单词的适当形式完成句子
11. Jay spends a lot of time
____________(practice)singing.
12. They
_________( build) new schools for the children in poor places
next year.
13. We all know the
_________(earth) moves around the sun.
14. Jenny is good at making flowers with
_________(paper).
15. We spent
_________(part) of time in the museum.