They said good-bye, hardly knowing that they ______again.
I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
—He isn’t particular about his food.—Yes, he eats_____________ anything.
I lost my way in complete darkness and, matters worse, it began to rain.
Flight BA 123 to Vienna is now boarding at
—Look at these tracks. It __________ be a wolf. —It needn't be. It be a fox.