He has worked the maths problem for nearly an hour but he simply can’t work it .On ;at B. on ;out C. at ;up D. for ;out
–Do you have any plans for this Sunday? --I’m not sure. I ______ go to the countryside to see my grandmother.
Drive slowly, Mary. ______ is something ahead on the road.
–What do you think of your Junior Middle School life? --I think it is colorful, ______ I am always busy.
Now, people have more free time. Square Dancing is becoming more and more ______.
Going to the movies is good, ______ I really only like listening to music.