In this teaser, you are challenged to find the missing letters in the following list of words. Written to the right of each word is the value of that word. Each letter in the alphabet is assigned a different worth: a=1, b=2, c=3... and so on. By adding together the worth of each individual letter, you will get the value of the word.
As I have said before: it is your job to figure out the missing letters.
Good luck!

Here is an example:
Ap_le (50) ~ the missing letter is "p"

Now, it's your turn:

1) de_r_ _ (56)

2) _r_bs_a_e (104)

3) vo_pl_n_ (97)