14. I don’t have a headache_____ .

13. They don’t know they are _____ danger.

12. What did the girl forget_____?

11. Father is sleeping. Please turn ___ the radio.

10. We can’t do two things at _______ time.

9. Water _______into ice at 0℃.

8. My parents’ parents are my ________.

7. We always come to the class on ________.

6. Plants give _______ to the animals.

5. -What’s the _______ with you? -I have a cold.