It was some time _____ I realised the fact that life had become difficult for many villages in western Europe.

　　　, the worse I seem to feel.

Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century. 

This is the very reason ______ he gave for his coming late to the meeting. 

— I like football.— ______ my sister and me.