12.The teddy bear is 200.000 dong. It is put on the top shelf.
=>The teddy bear putting on the top shelf is 200.000 dong.
13. The oranges were sweet. They were bought by my mother.
=>The oranges which were bought by my mother were sweet.
14. The buses are all new. They run along this route.
=> The buses running along this route are all new.
15. The bags are our team’s. They are hung on the wall.
=> The bags hanging on the wall are our team's.
16. She wore a skirt. It was made of cotton.
=> She wore a cotton skirt.
GOOD LUCK!!!
XIN HAY NHẤT!
@hahoang207