—Hurry up! The bus is coming. —Wait a minute. Don’t cross the street _______ the traffic lights are green.

_______ Peter is old and weak, he still has to work.

Their clothes were ______ colorful ________ I could not stop taking photos.

Learning to write is learning to think. You don’t know things clearly _______ you can write them down.

Some people waste a lot of food___________ others don’t have enough to eat.