2.This is the factory_________ they visited two years ago.

2.This is the factory_________ they visited two years ago.
A./ B.where C.who D.when
3.All ______ is a continuous supply of the basic necessities of life.
A.what is needed B.for our needs C.the thing needed D.that is needed.
4.Do you still remember the days ____ we spent together in the country?
A.that B.when C.where D.who
5.Do you remember those days ___ we worked together in the country?
A.that B.which C.when D.the one