pronunciation

[bread]

I would like to ask some questions concerning pronunciation.
I heard people say following words in several different ways:

First of all <---1) Firs sof fall 2)First dof fall
Last year <---1)Last dear 2) Last shear 3) Las syear
World has <---1)World das 2) World las
Want it <--1)Want dit 2)Want nit

Which ones are correct?

Thank you in advance!!! :o

[Casiopea]

Try these,

first of all
a) first-ta-val
b) first-da-val

last year
a) last chear
b) last jear

World has
a) worl-daz
b) worldaz

want it
a) wannit
b) wan-tit

:D

[Tdol]

You may well hear British speakers dropping the 't' sound completely in 'first of all'.