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1. The boy is crying. I think ________ is hungry and wants ________ mother.
2. Helen is a student and Miss Smith teaches ________ English.
3. I'm old enough now. I can finish the work by ________.
4. Come on Monday or Wednesday. ________ day is OK.
5. —Are the keys ________, girl?
    —No, they are not ________.
6. Obey the traffic rules and learn to protect yourself. ________ is more important than life.
7. —What _______ do you want to have?
    —Thanks, that's enough.
8. Xiao Li is the right person who shows the foreigners around, for ________ of us can speak English.
9. —Which trousers are his?
    —The green ________ are his.
10. Tom often comes to see me. He is a friend of ________. 
11. September the ________ is Teachers' Day. Let's make some cards for our teachers.
12. The text is very easy. There are ________ new words in it.
13. —________ is wrong with my throat. I just feel thirsty.
     —Why not have ________ water?
14. —Shall I sit at this end of the boat or the other end?
     —If you keep still, you can sit at ________ end.
15. Our teacher asks us to read English ________ a day.
16. We enjoyed ________ at the party last night.
17. He has a dog. I want to have ________, too.