1.  don't                6.  you're            11.  shouldn't      16.  they're
2.  won't               7.  doesn't           12.  couldn't        17.  it's   
3.  wouldn't          8.  I've                 13.  where's          18.  we've
4.  there's             9.  here's             14.  hadn't            19.  when's
5.  we're              10.  wasn't            15.  aren't            20.  haven't

                                           Challenge Words
1.  it'll          2.  who'll         3.  might've         4.  mustn't      5.  we'd

Lesson 17 Words - Final le, al, en

1.  chicken      6. several         11. threaten      16. marble
2.  eleven        7. natural         12. diagonal      17. oval
3.  given         8. needle          13. paddle         18. mumble
4.  jungle        9. single           14. animal         19. tangle
5.  national   10. citizen         15. spiral            20. frighten

Challenge Words

1. strengthen   2.  knuckle   3.  individual   4.  cubicle   5. three-dimensional