Find the missing number?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
GF, KI, OL, SO, ?

Select the number that can replace the question mark (?) in the following series.   

16, 20, 29, 45, 70, ?

2, 4, 12, 48, 240,?

Find the missing number?

Select the missing number from the given response.

Find the missing number?

3, 4, 7, 7, 13, 13, 21, 22, 31, 34, (..)