听力 1. What is Mary's plan for Saturday? A. Visit her mother.[DW] B. Cook dinner for Tom. C. Ask John and his wife to dinner. 2. What does John say to Mary about the invitation? A. He is not free. B. He'll certainly go. C. He's not sure. 3. What has John promised to do? A. Phone back with an answer. B. Persuade Jane to join him. C. Visit Mary's mother on Saturday.