填空 A: 1 , Jim!There is a big bag 2 the tree. B: What's 3 it? A: I don't know.I 4 there are some books. B: 5 , I think 6 a football. A: Let's go and 7 it. B: Ah,there are 8 and a football. A: Oh,there is a name on the bag David Smith. B: It's 9 Let's find him 10 give him the bag. (     ) 1. A.Look (     ) 2. A at (     ) 3. A at (     ) 4. A thinks (     ) 5. A Yes (     ) 6. A there's (     ) 7. A opens (     ) 8. A some flower (     ) 9. A.David (     ) 10. A but B. Look at B. on B. under B. guess B. No B. there B. open B. any flower B. David's B. or C. See C. under C. on C. guesses C. OK C. its C. to open C. some flowers C. Smith C. and D. See at D. in D. in D. thinking D. that's all right D. there are D. opening D. any flowers D. Smith's D. so