We should do pricing before we open our store. -- Correct sentence~ ^^ 

Can I finish this project within two and a half minutes?-- Correct sentence~ ^^ 

We have a regular customer, and he always orders hot chamomile tea. -- Correct sentence~ ^^ 

I and my parents have different perspective in traveling alone.

Better say: My parents and I have different perspectives on traveling alone.

That store have been doing special offer since last month.

Better say: That store has been running special offers since last month.

She was absolutely awesome when she was a athlete.

Better say: She was amazing as an athlete.

Reading is what he do when he is simply bored.

Better say: Reading is what he does when he is simply bored.

He always blames another when he make a wrong choice.

Better say: He always blames others when he makes a bad decision.

I wanted to ask her, but she seemed like hectic.

Better say: I wanted to ask her, but she seemed busy. 

This band uses understatements in their lyrics. --Correct sentence~ ^^ 

You can work right away once you fill out this form.--Correct sentence~ ^^