12. Thanks for ______ (sweep) the floor for me, Tom.
13. It’s too difficult. I can’t finish the work ______(without) your help.
14. We celebrate ______ (nation) Day on October 1 everyyear.
15. A lot of ______ (visit) came to our schoolyesterday.
16. The students are having a ______ (meet) on theplayground.
17. ______ (luck), the boy was not badly hurt in theaccident.
18. His parents are still ______ (alive), but he diedtwo years ago.
19. Tina’s father is a computer ______ (program), andhe has a lot of work to do every day.
20. Chinahas built a new Great Wall across the ______ (north) part of the country.