CORRECTED SENTENCES:

Now, let's move on activity2! = Now, let's move on to Activity 2!

Let's sing an interesting chant! /

It's time for the 'Survey Activity' Let me explain how to play. = It's time for the 'Survey Activity.' Let me explain how it's played. / Let me explain how to play it.

this is a pair work. = This is pair work.
I need a volunteer. Any volunteer? Good. 시아, come up to the front please.
- I'll give you this worksheet.

Then, we all walk around classroom, when you meet friends and I ask "Why are you so sad?“ to 시아. = Then, let's all walk around classroom. When you meet a friend, ask "Why are you so sad?“ like I asked 시아. 
- Then, 시아 answer the question like this "Because I lost my dog". = Then, everyone should answer the question like this "Because I lost my dog". 

And write down 시아's name and answer on the worksheet. = And write down your friend's name and answer on the worksheet.
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techer I want to check the conjunction. = Teacher, I want you to check the conjuction.

And then l would like to know other compliment for the feedback.:)  = And then l would like to know other comments for feedback. :) 

COMMENTS:

It's quite confusing for me to correct this script. Of course, there is a volunteer but I think it should be an example and there should be two volunteers. Hope that helps.