— Will you go to Sandy’s birthday party? — I won’t go unless Tony______.
I really enjoyed your speech,________ there were some parts I didn't quite understand.
I enjoy fresh air so I always let the window open ________ it is really cold.
We will have no water to drink ________ we don't protect the earth.
—You bought the car about ten years ago? —Yes.________ it's old,it still runs well.
Mark isn't coming to the concert ________________ he has got too much work to do.