-__________ can you finish your homework, Ben?- In thirty minutes.
---- Look! A man is cutting a tree on the moon.----It ______ be true. The teacher said there is no air on the moon.
All of us went to the park ______ Bob. He had to look after his sister.
I wonder when they _______ for Beijing. I will go to the train station to see them off when they_______.
---- Which would you like, tea or coffee?---- _______. I really don’t mind.
When the students were playing games on the playground, Jim suddenly stopped ______and began to cry, so we stopped _______ what was wrong with him.