How long do you think ______ the Microsoft brings out a new product?
Is honesty the best policy? We ______that it is when we are little.
Only ________ can you hope to make improvement in the operating system.
—______ the only house of Mr Smith got completely burnt out?—That's right.
How do you ______ a car accident when it happens?
She had to ______ their young children by herself after her husband died.