It is thought that Henan Shuanghui Industry Group Co., Ltd. ____take responsibility for its consumers. 

--- _________ David be the new chairperson of the Students’ Union? --- He ________ be, but I’m not sure.

--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?--________ my students have a try?

 — I promise Shirley ______ get a new iPad on her birthday. — Will it be a big surprise to her? 

His work _____ have been completed; otherwise, he wouldn’t be enjoying himself on the beach.