Let's practise some Greek! How do you say 'now' in Greek?

Let's practise some Greek! How do you say 'one' in Greek?

Let's practise some Greek! How do you say 'song' in Greek?

Let's practise some Greek! How do you say 'sun' in Greek?

Let's practise some Greek! How do you say 'man' in Greek?

Let's practise some Greek! Which of the following sentence is correct?