Conversational English: Choose the Right Response!

Scenario: A coworker or friend says “I really love your presentation today!” What is the most natural way to respond?

Thank you so much, I worked really hard on it!

Scenario: Someone asks you, “Are you free to grab coffee sometime this week?” Which response shows correct grammar and conversational timing? 

I am free on Thursday afternoon. Does that work for you?

Scenario: You need a colleague to look over a document quickly. Which phrase is the most polite and natural? 

Could you spare a few minutes to look this over when you have a chance?

Scenario: A friend tells you, “I just won a free trip to Japan!” Which is a natural native-sounding reaction? 

Scenario: You didn’t quite catch what someone said on the phone, and you need them to explain it differently. What is the most natural and polite way to ask?

I'm sorry, could you say that another way just to make sure I understand?

You are talking too fast for me to think.