Answer:
1st: is able change to be able
2nd: transform change to transforming
3rd: have the steady speed change to does the steady speed; had any effect change to have any effect
hope this helps:))
A thesaurus is the one to use because it contains synonyms, synonyms are different words that mean similar things. Such as Attack which is synonymous with words like assail and assault <span />
I think it's either A or D. Sorry, can only help you until there Good luck!