There are not enough seats for the guests. We need _____ chairs.

The lead singer was ill and couldn’t sing that night, and her _______ didn’t perform well, which made the audience disappointed.

Faced with the bad economic situation overseas, more Chinese students are returning home after studying abroad, a _______ that looks likely to continue in the coming years, a report released this week says.

We think anyone whose careless actions＿＿＿＿＿serious results should be punished．

Even students with        intelligence can be excellent students after improving their study habits.