翻译句子。
1．汤姆别无选择，只好放弃他的爱好。
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2．自从2007年以来，这个学校的学生人数大大减少了。
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3．我们怎样能获得学习和锻炼之间的平衡？
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4．老人坚持说他儿子与这个案子无关联。
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5．杰克真是自私，没有把他的玩具与别的同学分享。
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1. Tom had no choice but to give up his hobby / hobbies
2. The number of the students in this school has been reduced greatly / much since 2007.
3. How can we achieve balance between study and exercise?
4. The old man insisted that his son was not involved in / had nothing to do with / was not connected with
the case.
5. It is selfish of Jack not to share his toys with his friends.
(答案不唯一)