_____ we continue to kill elephants for their ivory,we humans will lose them in the end.( )
If
Before
Until
Although
I still remember my first teacher we haven’t seen each other for many years
I’m sorry I’m very busy now.If I ______ time, I ______ come to see you.
If Tom_________ the game, he will be the__________.
--- Hurry up! The bus is coming. --- Wait a minute.Don’t cross the street the traffic lights are green.
— Was it under the tree ________ you were away talking to a friend? — Sure.But when I got back there, the bike was gone.