1. Hi, Mr. Where to?

- Incheon Airport, please.

(In this dialogue, what is the full form of 'Where to?")

2. He checked his magic hat to make sure the secret part was still working.

(Is 'sure' the object complement of the verb 'make'? And then is the 'the secret .....working' the object of 'make'? Is 'that' omitted after 'make sure'?)

1. "Where do you want to go to?"

2. I'm not sure of the "object complement," but "working" seems to be part of the verb "was...working."

(Although I can tell you what expressions are more acceptable, the parts of speech in English are not my area of expertise. Does that make me look "foolish"?)