When the party was over, he ______ his friends good-bye and ______.
Tom thinks _____ important to get to know his students well.
_____ is known to us all _____ Lu Xun is famous for his great works_____ a great writer.
When he left _____ college, he got a job as _____ reporter in a newspaper office.
We _____ a word unless she asks us_____.
It was _____ that I didn’t like to leave my room.