完形填空。 Once there was an old farmer, with a horse which was almost as old as himself. He 1 one morning with his young son, 2 the horse before it died. Father and son walked, 3 the farmer did not want the horse to be 4 ? They met two men on the road 5 said: 'Why are you walking, farmer? You have a horse. It's 6 to market.' The farmer knew that this was 7 , so he rode on the horse, 8 his son walked. ? Then they met two old ladies. ' 9 are you doing up there, farmer? Can't you 10 how tired your boy is?' 11 the farmer got down, and his son rode 12 ? 13 , three old men stopped them. One said: 'Why are you walking, farmer? 14 . It's too hot for an old man like you to walk today.' So the farmer got up 15 his son, and they 16 ? 17 , a young woman passed them. 'Why aren't you walking?' she asked. 'It isn't 18 to market. Give your poor old horse a rest.' So the farmer, and his son, got down 19 ? It is a fact that you cannot please 20 the people all the time. ? (     )1. A. set out (     )2. A. selling (     )3. A. so (     )4. A. very tired (     )5. A. which (     )6. A. a short way (     )7. A. real (     )8. A. while (     )9. A. What (     )10. A. see (     )11. A. Because (     )12. A. thus (     )13. A. First (     )14. A. Sit down (     )15. A. behind (     )16. A. walked on (     )17. A. Some time later (     )18. A. near (     )19. A. once again (     )20. A. both B. set up B. buying B. because B. too tired B. who B. a long way B. true B. when B. How B. watch B. As B. yet B. Finally B. Sit up B. after B. rode on B. A moment ago B. long B. on their own B. each of C. set down C. to sell C. that C. quite tired C. as C. the right way C. truly C. as C. Why C. look C. For C. instead C. Near C. Get up C. beside C. moved on C. In no time C. far C. the other day C. all D. set? D. to buy? D. when? D. tiring? D. where? D. the wrong way? D. really? D. during? D. When? D. notice? D. So? D. either? D. Next? D. Get down? D. above? D. drove on? D. At once? D. short? D. all the same? D. none of