C
The year of 2023 is called the Year of the Rabbit in China and the Year of the Cat in Vietnam (越南). Ancient storytellers said the Jade Emperor 1. (organize) a race across a river for all the animals in the world. The Jade Emperor decided 2. (choose) the first 12 animals that reached the other side to appear in the zodiac signs(生肖).
In the Chinese story, the cat and the rat were riding across a river on an ox 3. one side to the other side when the rat pushed the cat into the water. In the story, 4. (turn) the two animals into enemies is the result of this race. That is why cats have been hunting rats ever since. In the Chinese story, the rabbit crossed the river by jumping on 5. tops of stones in the river. When the rabbit got there, no others were around. It 6. (simple) thought the race was too easy. The rabbit was 7. (bore) with the race so it went off to the side and slept. By the time the rabbit 8. (wake) up, three animals had already arrived. 9. , in the Vietnamese story—which did not have a rabbit—the cat could swim and ended up arriving fourth. The top twelve finishers are "rat, ox, tiger, cat (or rabbit), dragon, snake, horse, goat, monkey, rooster, dog, and pig".
One explanation for changing "rabbit" with "cat" might have to do with people's impressions on the two animals. In Chinese, the rabbit 10. (describe) as a lucky animal which is loved by people. The Vietnamese think the cat is a lucky animal.

D
We all know doing exercise makes us healthy. But many of us don't know which is better, to exercise in the day 1. at night. Dr. Yang, a famous sleep doctor, 2. (advice) people to do outdoor exercise for 3. least 30 minutes a day in the daytime.
Dr. Yang has 4. (do) research(研究) on sports and sleep for years. He finds out that those who 5. (exercise) in natural light for half an hour every day have better sleep and more energy. Dr. Yang 6. (he) gets up at 6:30 a. m. Then he usually takes a walk outside. Sometimes, he walks his two dogs in the park in the afternoon with his sunglasses left at home.
Many schools put Dr. Yang's findings into practice. They made it 7. rule that students should do outdoor exercise once or 8. (two) a day. In some schools, students even formed outdoor running clubs. After some time, most students said they benefited a lot from outdoor exercise. Now they sleep better and concentrate(集中) 9. (much) on their studies.
Some students are now thinking about 10. (invite) their teachers to join them in their daily runs.