Was heißt »hä« auf Englisch?

Die Interjektion »hä« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

For Mary, it was a dream come true. She was so happy that she didn't know what to do with herself.
I just didn't know what to say, so I said nothing.
I just didn't know what to say, so I kept quiet.
Tom said he didn't know what was in the box.
I didn't know what I'd find here.
Why did Tom say you told him you didn't tell John what we were going to do?
I thought you didn't want to talk about what happened.
Tom didn't do what he did because Mary told him to, but because he wanted to.
He didn't know what to do with the leftover food.
He didn't know what to do with the leftovers.
They didn't tell you what he wrote in that letter.
She pretended she didn't hear what he was saying.
She pretended she didn't hear what he said.
We didn't know what to say.
I didn't know what to say, so I said nothing.
Since I didn't know what to say, I said nothing.
Not knowing what to say, I didn't say a word.
I'm tired of pretending that what happened didn't happen.
It all happened so quickly that we didn't have time to work out what was going on.
I wonder what people would think if I didn't attend Tom's wedding.