—Would you like_______ the environment?

—I don't know. What can I do? [ ]

A. help save  

B. helping save  

C. to help saving 

D. to help save

I'm terrified _____ the dark. I go to sleep _____ my bedroom light _____. [ ]

A. of, on, on

B. of, with, on

C. with, with, on

D. with, on, on