A farmer was put in prison(监狱). One day, he got a letter from his wife. "I am worried about our farm," she wrote. "It's time to plant potatoes, but I can't do all the digging(挖) by myself." The farmer thought over and then had an idea. He wrote to his wife, "Don't dig the fields. This is where my gold(金子) is. Don't plant potatoes until I come home." A few days later, the farmer got another letter from his wife. It said, "Two days ago, about ten prison guards(监狱看守) came to our fields. It looked as if they were looking for something. They have dug our field." The farmer wrote to his wife at once. "Now you can plant our potatoes," he wrote.The farmer was put in prison _____.A. because he had done something wrongB. because he had a lot of gold in the fieldsC. The writer didn't say anything about why the farmer was put in prisonD. For nothingThe farmer's wife was much worried about _____.A. her husbandB. their farmC. planting potatoesD. herselfThe farmer told his wife _____ first.A. not to dig the fieldsB. to dig the fieldsC. to ask the prison guards for helpD. to find the gold in the fieldsWhy did the prison guards dig the farmer's fields? _____.A. They wanted to help the farmerB. Their leader ordered them to do soC. The farmer asked them to do soD. They wanted to find out the goldWhy did the farmer ask his wife to plant potatoes at once？Because _____.A. their fields had been dugB. the gold was found outC. the prison guards asked him to do soD. the prison guards were digging the fields