DATA FREQUENCY CONVERSION METHOD CHOICE

[sw2018]

Hi all, I am currently working on formatting my database. It has around 4000 companies information. After downloading all the information, I realized that most of my variables only have semi-annual data available. I need to convert SEMI ANNUAL TO MONTHLY. So, I tried to do the frequency conversion on these variables ON EVIEWS, but there are different methods such as Linear, Constant,Quadratic, Cubic, Point, Denton to do this conversion. Now, I am not sure which method I should choose. My variables are:
1. TOTAL ASSET
2. LONG TERM BORROWING
3. TOTAL LIABILITY
4. DEBT TO ASSET RATIO
5. NET INCOME
6. LIQUIDITY RATIO I.E. CURRENT RATIO
7. ASSET TURNOVER RATIO
8. PROFIT MARGIN

So, I would be super super grateful if based on these variables, anyone could help me figure out what data frequency conversion method on EVIEWS works best, or what method is suitable for which variable. Thank you in advance!