Lab presentation was

Not so good.
I should have prepared more, but I couldn't.

What I should have done during my presentation were:

• I concentrated on only the screen, not much on the audience.
• I couldn't ask audience to ask what is the question. I should have said "Question is ..., right?" or "Could you say it again?".
• I couldn't make logical sentence structure.
• I should have more time to talk to somebody in English.