I will just do Activity 4, I hope that's all you need

1. You would say: Hi Rangga, nice to meet you.
  Rangga would reply:Hi(Your Name Here), nice to meet you too.

2. You would say: Good Morning (if 0 to 12 o' clock), Good Afternoon (if 12 to 18 o'clock) Principal, nice to meet you.
   Principal would reply: Hello (Your Name Here), nice to meet you too.

3. You would say: Hello Neighbor, how has your day been. (Assuming you know them)
   Your Neighbor would reply: Hello Neighbor, my day's been great/bad

4. You would say: Hi Fikri, it's nice to finally meet you.
   Fikri would reply: Hi (Your Name Here), it's nice to finally meet you too.

5. You would say: Hi Dad, how has your day been.
   Your Father/Dad would reply: Hello Son/Daughter, my day's been great/bad

I hope this helps