When I am tired with math exercises, I            go out for a walk to get relaxed.

I lost your address, otherwise I＿＿＿＿you long before. 

You can’t imagine that a well –behaved gentleman ______ be so rude to a lady. 

—Did you go to the fashion show last week?—I ________，but I was fully occupied the whole week.

---- Is it good to look up every new word when I come across it in reading?---- No. You ________,  because you are likely to guess the meaning from the context.