Who told you to the fruit on the ground

start gazing into the night sky with a telescope, soon we’ll be astonishedby the realization _______ we and our world are part of this giant system

The sports meet has been _________ because of the thick fog,so we’ll have our lessons in our classroom.

下列各句中加点的词语，使用恰当的一项是( )

1Say "________" when you meetyour friends.