I will never forget the day when has been marked up in the history.（)

A.that

B.when 

C.which

A.when

B.which

C.in which

D.where

I'll never forget ______ (see)the musical comedy in New York．

A.forgive

B.forget

C.forgave

D.forgot

I can never forget the day ____ I got the first prize in the competition.

A.that

B.where

C.which

D.when

I will never forget the days _______ I spent with my friends in Beijing.

A.when

B.that

C.in which

D.on that

A.that

B.where

C.when

D.how

I can never forget the day _____ we spent together.

A. when

B. in which

C. at which

D. which

A.though

B.before

C.while

D.as