Without your help, I ＿＿＿＿the exam last term.

Do you know _______ girl with long hair—Yes, she is Mary. She plays ______ piano very well.

下列加横线的成语，使用不正确的一项是（ ）

For her, happiness ________ helping those in trouble.

The TV doesn’t work. I want to have it .