As you know, it is my duty to __________ my younger sisters from being hurt when they are in danger.
| A．prevent | B．keep | C．stop | D．protect |
—I have telephoned him twice but I couldn’t get through.—I think that the line _____ be being worked on today.
| A．should | B．might | C．need | D．would |
They must have gotten to the top of the mountain by now. They_____ before the sun rose.
| A．settled down | B．set out | C．took off | D．turned up |
—Lucy, go do the washing please.—_______ I just did it yesterday.
| A．It’s your turn. | B．It’s up to you. | C．So what? | D．With pleasure. |
He is very_____; it is impossible to talk him into doing anything he doesn’t want to.
| A．stubborn | B．curious | C．skeptical | D．gracious |
It was only then ______ I began to have doubts about whether my story had ever been told.
| A．when | B．Since | C．that | D．yet |