It is difficult for us to learn a lesson inlife_________we’ve actually had that lesson.

During the last three decades, the number of people participating in physical fitness programs ________ sharply.

In addition to what ________ above, his speech was also involved in some big issues of our society

There _____ a pen, two pencils on the desk.

Jim, it’s so late . are you busy with— My homework.. If I don’t finish it, my teacher will be angry with me.