Choose the word or phrase (A, B, C, or D) that best fits each space in the following passage. Communication can be in the form of words, pictures, or actions. Words are the most commonly used: we speak or write to communicate ideas. It is, (46)_______, essential for people to use words effectively. Pictures are useful, also. Businesses use them successfully in posters, charts, and blueprints. Companies should be careful that the pictures (47)______on posters and charts, as well as in brochures and advertisements, and the words compliment, rather than conflict, (48)______each other. Action is an important communication medium: actions speak (49)_______than words. This medium is the most important when dealing face-to-face with employees, colleagues, and clients. A frown, a handshake, a wink, and even silence have meaning; people will attach significance (50)_______