We can't cross the road ______ the traffic lights turn green.( )
until
if
while
as
()If there _____ no buying and selling of animals, there will be no killing in nature.
In summer milk will quickly go bad_____ it is put into a fridge.
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__________.