Complete the following sentences using if or unless. 1. I won't be able to help you __ you tell me what is wrong. a) unless 2. He should be in his office now __ he left early today. a) unless 3. __ you come now, I am going to leave without you. a) Unless 4. __ you don't stop smoking, you will fall seriously ill. b) If 5. The robber threatened to shoot me __ I didn't give him the money. b) if