Just as Professor Scott often ______ it, success is ninety-nine percent mental attitude.
—You were out when I dropped in at your house. —Oh, I ________ for a friend from England at the airport.
It is said in the book that Thomas Edison (1847—1931) ________ the world-leading inventor for sixty years.
Because the shop ________ , all the T-shirts are sold at half price.
The discussion ________ alive when an interesting topic was brought in.
The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.