Was it by cutting down staff _ _she saved the firm? —– No, it was by improving work efficiency.

I feel sad. My grandfather’s leg is _______.

Mr. Brown is a friend of ________ . They often talk with each other on the Internet.

approached to the subway entrance,an explosion occurred This ___my first experience, I got into panic

The traditional view is ________ we sleep because our brain is “programmed” to make us do so