The film was so ______ that I fell asleep.

• A. Exciting
• B. Boring
• C. Dull
• D. Long

Answer: (B)

The idea being tested is how we use so + adjective + that to express a result: something is so uninteresting that it causes a reaction. Here, the word that best fits the idea of causing sleep due to lack of interest is boring. It directly signals a strong level of uninterest, which naturally leads to dozing off.

Exciting describes a high level of interest, which would unlikely lead to sleep. Long focuses on duration rather than how interesting something is, so it doesn’t fit the cause-and-effect with falling asleep. Dull can work, but boring is more natural and common in everyday speech for this situation, making it the best choice.