1．what is the way you thought of ()them out of difficulty?

1．what is the way you thought of ()them out of difficulty?
1．What is the way you thought of ()them out of difficulty?
A.of helping B.helping C.helps D.helped
2.What is that ( )flashed in the sky just now?
A.that B.what C.who D.which
3.We saw several natives advancing towards our party ,and one of them came up to us,( )we gave some bells and glasses.
A.to which B.to whom C.with whom D.with which
4.The book was written in 1946,( )the education system has witnessed great charges
A.when B.during which C.which D.where