Though the key was pressed, nothing ______ on the screen.

I didn’t know when he     back. He said he would call me when he     home.

 TV-Turnoff Week, _______ millions of people around the world participate every year, tries to encourage people to turn on life.

 If Tom had spent more time studying, he       able to do well in the test now.

Though the story of Li Yunlong in the TV drama “Bright Sword” is a fiction, much of __________happened is historically true.