A. 词汇与语法。
The Clever Fisherman
Once upon a time, there 1. (be) a poor fisherman. One day, he 2. (catch) a bottle in his net. When he 3. (open) it, a genie 4. (come) out. The genie 5. (look) angry and 6. (shout), “Prepare to die!” The fisherman 7. (feel) scared, but he 8. (think) quickly. He 9. (ask) the genie, “How can such a big genie come from such a small bottle?” The foolish genie 10. (show) him how to get back into the bottle. He 11. (turn) into smoke and 12. (go) back into the bottle. The fisherman 13. (close) the bottle at once. He 14. (save) himself and 15. (regret) opening the bottle at first! From the experience, he 16. (study) that he should think twice before he acts.

1. was 2. caught 3. opened 4. came 5. looked 6. shouted 7. felt 8. thought 9. asked 10. showed 11. turned 12. went 13. closed 14. saved 15. regretted 16. studied

这是一篇叙事类童话故事，开头的时间标志"Once upon a time（从前）"说明全文描述的是过去发生的事件，所有括号内给出的动词都需要变为对应的一般过去式，符合故事叙事的时态要求：
1. there be句型中主语a poor fisherman是单数，be动词的过去式用was；
2. 动词catch的过去式为caught；
3. 动词open的过去式为opened；
4. 动词come的过去式为came；
5. 动词look的过去式为looked；
6. 动词shout的过去式为shouted；
7. 动词feel的过去式为felt；
8. 动词think的过去式为thought；
9. 动词ask的过去式为asked；
10. 动词show的过去式为showed；
11. 动词turn的过去式为turned；
12. 动词go的过去式为went；
13. 动词close的过去式为closed；
14. 动词save的过去式为saved；
15. 动词regret的过去式为regretted；
16. 动词study的过去式为studied。