11. They clean the floor every morning.
-> The floor ____________________________________
12. They will solve the problem soon.
-> The problem __
13. They break the glass into small pieces.
-> The glass ____________________________________
15. They made these cars in the USA.
-> These cars ______________________________________
16. People have used the Internet all over the world.
-> The Internet ___________________________
17. We planted many trees in the school garden.
-> Many trees _________________________________
18. Someone has taken my book away.
-> My book ___________________________________
19. He didn't help me with my homework.
-> I ___________________________________________
20. We have learnt English for three years.
-> English ______________________________________
21. My father often reads books before bedtime .
-> Books ............................................................................
22. Lan bought some comic books for her brother .
-> Some comic books ..........................................................
23. My sister received a letter yesterday .
-> A letter ............................................................................
24. She can solve the problem in just 2 minutes .
-> The problem .....................................................................
25. Nowadays people use electricity for lighting.
-> Electricity ...........................................................................