I shall never beat John at tennis; we are clearly not in the same _____.
I just can’t understand ______ that makes so many young people addicted to playing online games.
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.