Not until he left his home ______ to know how important the family was for him.

known the party was so boring, I wouldn’t havecome. I __anything.

_________ nice trip to travel by air!—__________.

Many people are not fully aware of the damage that it does to their health. This is ____ we chose this picture as our logo.

is surprising to us is that Tom can speak English fluently as though he were a native speakdr.