根据中文补全句子
1. 尽管我学习不好，但我从未放弃过。
___________I didn’t do well in my lessons, I _________ gave up.
2. 鲍勃将跳远的世界纪录保持了多久?
How long did Bob __________ the world __________ in the long jump?
3. 听到那悲伤的消息，他忍不住哭了。
He couldn’t ________ ________ when he heard the sad news.
4. 当我到达火车站时火车已经开走了。
The train ________ ________ when I got to the train station.
5. 如果每个人都能为保护环境做出自己的贡献，这个世界将变得更加美好。
The world will become much more beautiful if everyone ________ a contribution to ________the environment.
(2009年 甘肃兰州)
参考答案：
1. Though/Although, never
2. hold/keep, record
3. help crying
4.had left/gone
5. makes, protecting