— Can you tell me ____________?
— It happened at 3:00 pm.
| A．when did it happen | B．where it happened |
| C．when it happened | D．where did it happen |
— TV was invented in _________ century.
— Is that true?
| A．twenty | B．twentieth | C．the twenty | D．the twentieth |
—When _________ personal computers _____________?
—In 1976.
| A．is, invented | B．did, invent |
| C．were, invented | D．was, inventing |
—Must I finish my work today?
—No, you ____________. You _____________ finish it tomorrow.
| A．mustn’t, can | B．can’t, must |
| C．needn’t, may | D．may not, may |
I think the Great Wall is _________ unusual wonder in the world.
| A．a | B．an | C．/ | D．the |