我们在测试分数上看到了显著的改进。

We are seeing significant ___improvements in test scores.

他仍在恢复中，但医生说他显示出了一些改善。

He is still recovering, but the doctors say he has shown some ___improvement.

每天只需骑行二十到三十分钟，就能让你的整体健康状态得到显著改善。

Just twenty to thirty minutes riding every day gives you a considerable ___improvement in your general state of health.