—Hey ,it’s you, Jackie! I didn’t think you could be here．—A big surprise ,right? I _______ for you all the afternoon．

Mo Yan has been the first          Chinese to win the Nobel Prize in Literature, ___________ arouses people’s interest in reading his works.

—Peter, where did you guys go for the summer vacation?—We ____ busy with our work for months, so we went to the beach to relax ourselves.

It’s been over a year since I ______ back from the countryside.

Scientists have many theories about how the universe_____.