选择括号中合适的单词完成句子。
1. Welcome _____ (to in) my home.
2. How many _____ (ducks duck) you see?
3. The library is on the _____ (one first) floor.
4. _____ (Do Are) you have a canteen?
5. I have lunch _____ (at in) school.
6. _____ (Let Let's) clean the window.
7. Look _____ (at in) the picture.
8. Listen _____ (to of) music.
9. My friend _____ (has have) big ears.
10. I'm _____ (her she) sister.