This is one of the happiest days ____ spent in my life.
| A．that have ever been | B．that has never been |
| C．which was ever | D．that had been |
The boy, who admitted _____ in the exam, promised the teacher that he would work hard at his lessons.
| A．cheat | B．to cheat | C．cheated | D．cheating |
In 1998, when he was only 19, Bill _____ to 5 years in prison for his acts of violence.
| A．sentenced | B．had sentenced | C．was sentenced | D．had been sentenced |
I failed in the job interview and only then _____ the importance of learning English well.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |
The audience waited until the curtain rose and then laughter at the sight of the funny actor.
| A．burst out | B．burst into | C．broken into | D．began with |
The kind lady devoted all her life to _____ those homeless children.
| A．help | B．helping | C．be helping | D．being helped |