11. the teacher spoke ....(slow ) enough for us to understand

12. she answered all the questions ....(good) than the other students and she got a very good mark 

13. this street is too .... ( crowd) couldn't  you drive a bit .... ( slow)

14. ....(poison) chemical waste should be treated before being dumped into rivers and lakes

15. do you think we need to preserve our ancestors.....(tradition)

1. i'm not the pasture right now. around me the cattle ........ ( graze) and the kids .......( learn) how to ride a Horse

2. millions of mongolians ..... (be) semi- nomadic herders for thousands of years

3. the nomadic women....( dance) around the fire when it ..... ( start) to rain

4. the nomadic people will move to look for a new land if the old one ....(become) infertile