-- I can’t believe that Jeff _______ have quarreled and fought with his boss.-- Well, if one _______ ask for trouble, it just can’t be helped.
He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.
--- It is strange that he ______ come so late. --- Something unexpected must have happened to him.
The farmers were busy getting in the rice in the field, only ______ for a drink once in a while.
Pierre Curie ______ his own research work and joined Madam Curie in the search for radium.
The young man is ______ Edison in our factory and he has made ______ number of important inventions over the years.