___ years ago, the population of China was over 20 million.
_______ hard-working boys! They have already worked for 3 hours without rest.
—Mum, may I draw some flowers on the wall?—Oh, no, dear, you _______. Why not draw your beautiful flowers on the paper?
—I think the magic from Liu Qian was the best program last night.—Oh, it’s a pity. I _______ cards with my family and missed it.
You will never know the result ______ you try it by yourself.
All of us thought Kathy would come to the speech contest. But she didn’t ______.