HSK3 汉字 (216-220)

敢
因为他害怕后果，所以不敢说实话。 他不敢说实话，因为他害怕这样做的后果。
He does not dare to tell the truth because he is scared of the consequences.

秋
初时秋天，天气还好。
Early autumn, the weather is still pleasant.

楚
你的发言恨很清楚。
Your speech was very clear.

耳
请我耳语！ 请悄悄告诉我！
Please whisper it to me!

镜
你为什么今天戴眼镜？ 今天你为什么戴眼镜？
Why are you wearing glasses today?

You've done a good job. Chinese actually is a very flexible language. I changed some of what you wrote. But It doesn't mean what you've written could not tell what you want to say. I just make them sound more idiomatic. 

HSK3 汉字 (216-220)

敢
因为他害怕后果，所以不敢说实话。 Since he is afraid of the consequences, he dares not speak the truth.
He does not dare to tell the truth because he is scared of the consequences.

Chinese prefer to state the causality first and then the consequence/result.  So your order needs to be changed.  Here's another way of saying,他之所以不敢说实话, 是因为怕后果

秋
初时秋天，天气还好。
Early autumn, the weather is still pleasant.

楚
你的发言很恨清楚。 It can be 演讲 since the English sentence is ambiguous.
Your speech was very clear.

耳
请我耳语！
Please whisper it to me!

This depends on the context.  If this is romantic then, 和我微声細语,  和我切切細语, If not, 跟我轻声/呫嚅/嗫呫.   交头接耳 is a more formal idiom

镜
你为什么今天戴着眼镜呢？
Why are you wearing glasses today?

HSK3 汉字 (216-220)

敢
因为他害怕后果，所以不敢说实话。
He does not dare to tell the truth because he is scared of the consequences.

秋
初时秋天，天气还好。
Early autumn, the weather is still pleasant.

楚
你的发言很清楚。
Your speech was very clear.

耳
请我耳语！ 请轻声对我说，耳语一般用于书面语
Please whisper it to me!

镜
你为什么今天戴眼镜？
Why are you wearing glasses today?