这位男士正在发表演讲。

The man is giving a ___speech.

婴儿在一岁左右开始发展语言能力。

Babies start developing their ___speech around one year old.

他慢条斯理的说话方式让人感觉很舒服。

His slow and measured ___speech makes people feel comfortable.

学术论文通常使用正式语言以避免误解。

Academic papers often use formal ___speech to prevent misunderstandings.