X. Fill in each blank with a correct preposition.
1. The teacher divided the class__________four groups
2. He provided us _______a lot of useful information
3. The teacher gave _________the exam papers
4. I was disappointed _________ the grade I received on my last exam
5. The ground is covered__________trash. You should clear _________all the trash on the ground before leaving
6. After several hours of discussion, the council finally agreed ___________a plan
7. My sister kept___________asking me question after question.
8. The garage has got full __________ junk again.
9. We are all responsible__________keeping the environment clean and clear. 10. Don't throw trash_______the water because polluted water can directely harm_________ people's health.