— The light in his room is still on. Do you know _________?
— To prepare for the coming exam, I think.
| A．if he works hard | B．why he stays up so late |
| C．why is he so busy | D．when he will stop working |
Nothing is______if you put your heart into it.
| A．necessary | B．difficult | C．different | D．possible |
My mother makes me____playing the piano for 2 hours every day and I’m very tired.
| A．practice | B．to practice | C．practicing | D．practiced |
—The song Where did the time go______the old days and the love of family.
| A．helps us out | B．reminds us of |
| C．lets us down | D．regards us as |
On this day，Dr.Martin Luther King_______，but we didn't know who________him.
| A．killed；was killed | B．killed；killed |
| C．was killed；killed | D．was killed; was killed |
Mary likes helping others._______, she often helps the old cross the road after school every day.
| A．Such as | B．For example | C．For free | D．Just as |