1. When the program is going on, the director sits in the control room. (At a TV studio)

2. When the program is continuing, the director sits in the control room. (At a TV studio)

3. When the program is happening, the director sits in the control room. (At a TV studio)

4. When the program is taking place, the director sits in the control room. (At a TV studio)

(Which one is similar to #1?

#4 is the best one that matches #1.

To determine which of the given statements is similar to #1, we need to analyze the meaning of each statement and compare it to the first one.

Statement #1: "When the program is going on, the director sits in the control room."

Statement #2: "When the program is continuing, the director sits in the control room."

Statement #3: "When the program is happening, the director sits in the control room."

Statement #4: "When the program is taking place, the director sits in the control room."

Based on the context and meaning of each statement, we can see that all the statements express the same idea. However, statement #3: "When the program is happening, the director sits in the control room." is most similar to statement #1: "When the program is going on, the director sits in the control room." Both statements use similar phrasing to indicate the presence of the director in the control room during the program.