As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?
Alice spent much time _____ the piano each day.
--- 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.