It is well known that knowledge is________treasure house，but practice is________key to it

Why not come and join us in the game—__________, but I must meet Mr Smith at his office now.

My father is a good driver. He has a pretty good of direction.

the majority of people you will meet whentravelling are sure to be friendly, there are dangers-theft being the mostcommon

Lucy is___ Lily. Lucy is outgoing, but Lily is very shy.