Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
— Have you finished your essay? — Half when you come back.
The visitor asked to have his picture taken _________ stood the famous tower.
Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.
Staying in a different country, just watch others to see _____ they act to decide what the best to say is.
The cheering went on for quite some time _____ it died down and people took their seats again.