─ Look, Stella is there!─ That ______ be her. She doesn’t like singing.

--Whose T-shirt is this? --It ____ be John’s. It’s ______ small for him. 

--- 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?

— My  clothes are out of  style.-—Maybe  you  should  ______ some new clothes.

—        I know by what time you want the project to be done?—By the day after tomorrow.      you finish it on time?