他演讲中的所有笑话都没有达到效果。

All the jokes in his speech ___fell ___flat.

文化参观活动没有达到他们的期望。

The cultural visits ___fell ___flat compared to their expectations.

如果活动没有达到预期效果，可能会令人失望。

If the event ___falls ___flat, it can be disappointing.