1. My favorite is music (which was/which is) written by Mozart.

2. I am reading a book (which was /which is) written by Hemingway.

(which one is right in the parentheses?)

3. After use, just take them off and wash the fat away.

(What is the meaing of "just' in the sentence?

1 answer

1 and 2 -- "which was"

In 3, "just" means "simply."
http://dictionary.reference.com/browse/just
See #s 11 and 12 here.