I knocked on the door but ______ answered.
-When should I hand in my paper?-It after class.
— ______ is it from your home to your school?—Two kilometers.
—Why do you look tired?—Because I until 11:50 last night.
She was ill, she still went to work and tried her best to do the work.
When he heard a cry for help, he ran out as as he could.