Объедините вместе две мысли. Используйте фразы, приведенные выше. Предложите максимально возможное количество вариантов.
On the one hand, people like watching animals perform tricks in the arena. On the other hand, circus animals, however, do not enjoy their sad life. People, and especially children, like circus very much. People take care of animals.
On the one hand, bears riding bicycles look very pretty. On the other hand, riding a bicycle is an unnatural thing for animals to do; they are forced to do it.
Dolphins enjoy playing with their trainers. But at the same time they are kept in uncomfortable and small swimming pools.
Animals in the circuses are taken care of, but one shouldn’t forget that animals suffer from being kept in cages.