The wave crashed and hit the sandcastle head-on. The sandcastle began to melt under the wave’s force and as the wave receded, half the sandcastle was gone. The next wave hit, not quite as strong, but still managed to cover the remains of the sandcastle and take more of it away. The third wave, a big one, crashed over the sandcastle completely covering and engulfing it. When it receded, there was no trace the sandcastle ever existed and hours of hard work disappeared forever. The above-mentioned event symbolizes the ______________ nature of things.

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**Solution:**

1. The passage describes a sandcastle being destroyed gradually by waves until it completely disappears.

2. This symbolizes the **ephemeral** nature of things, meaning things that last only for a short time and then vanish.

3. Explanation of options:
   - **Illusive:** deceptive or illusory, not fitting the context of disappearance over time.
   - **Ephemeral:** lasting for a very short time, perfectly matching the symbolism.
   - **Obtrusive:** noticeable in an unwelcome way, unrelated here.
   - **Bizarre:** very strange or unusual, not relevant.
   - **Boundless:** unlimited or immense, opposite of what is described.

**Answer:** (b) ephemeral

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