这些小疙瘩可能是过敏反应。

These small bumps may be an allergic ___reaction.

看到成绩单时，他的第一反应是惊讶地睁大了眼睛。

His first ___reaction was to widen his eyes in surprise when he saw the report card.

这个化学反应会释放大量的热量。

This chemical ___reaction releases a large amount of heat.

新教育政策遭到了保守派的强烈反对。

The new education policy met with strong ___reaction from conservative groups.

他们在社交媒体上发布了新歌，想看看粉丝们的反应如何。

They posted their new song on social media to check their fans' ___reaction.