The new policy allows a couple to have a second birth _____either is an only child.
--- You are always full of _____. Can you tell me the secret?--- Taking plenty of exercise every day.
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_____.