Hopsized Phone questions

Which letter or number comes next in these three sequences. 

Write your answers on the back of your answer sheet and give to host. Speed counts. 5 minutes max. 

 

1.    A,C, F,  J, O  __?

 

2.    Y, W, T,  P, K, __?

 

3.    X, C, W, D, V, E, __ ?

 

4.    2, 8, 18, 32, ___ ?