Have you ever wondered why some of the smartest students in your class sometimes ____ failing exams?

He took pity on the people in the flooded areas and___ his clothes and quilts to them.

Last weekend Peter had a great deal of fun with his family________kites in a park.

Lincoln died ____ the morning ___ April 15, 1865

I________ you for a long time. –Oh, I_______ in Beijing. I’ve just come back.