“All the students don’t work hard.” means “_________”

It was a difficult time, but we never ________ hope.

______ does this scarf belong to? — Let me see. Oh, it may be ______.

Where is Mr. Zhao?—He _________ to Mount Fanjing. He’ll come back _______ a week.

Can you understand my words? — Sorry, I can ______ follow you.