When I came back yesterday evening, my brother ________ his homework. A is doing B. has done C. was doing
—When will the second class begin? —________ two minutes.
I’m very proud of that Beijing is one of __________ cities in the world.
—Who helped Mark with his English? —_________, he taught himself.
Qingdao is a good place for summer vacation. My father ___________ there several times.
Remember to wash your hands __________ you have meals.