Hra and 80c investment not declare in form 16

Dear Friends,

For the FY 2014-15, I worked in two companies.first 6 month in 1st company and rest 6 month in 2nd company.Now I have two form 16 with me.

The problem is my first company didn't mention HRA and 80C investment in from 16 even after submitting investment proof. They haven't deduct income tax as, my 6 month salary was not taxable. Now If i combine both form 16 then i am under taxable income because HRA and investment is not declare by my first employer.

My question is, can I claim the HRA and 80C investmenr while filing the ITR. If yes, then how can i do it. do i need to submit any proof for that?

I searched many forums but still confused... i hope i will get some idea from here.

Thanks in Advance.