It was not until dark ______ he found ______ he thought was the correct way to solve the problem

Do you know Yao Ming Yes. He is one of basketball player in the NBA.

_______ of volunteers will be needed for 2014 International Horticulture Exposition in Qingdao.—Let’s go and _______ them.

Great changes have taken place in that school. It isno longer ______ it was 20 years ago, _____ it was so poorly equipped.

18I decided to write about Chaplin, one of ______ films I had seen several years before