Look. How clean the window is! It ________ just now.A. was cleaned B. is cleaned . has been cleaned D. will be cleaned
My mother makes me____playing the piano for 2 hours every day and I’m very tired.
—The song Where did the time go______the old days and the love of family.
On this day,Dr.Martin Luther King_______,but we didn't know who________him.
Mary likes helping others._______, she often helps the old cross the road after school every day.
I didn't understand_______. So I put up my hand to ask.