After he ---------------- the roof -------------.
a) left ,collapsed
b) has left , collapsed
c) left , had collapsed
d) had left, collapsed
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Explanation:
1. The mixture has no fixed composition.
2. To form mixture energy is neither produced nor evolved.
3. The mixture has no fixed melting points and boiling points.
4. Mixture retains the properties of its components.
5. Components of mixtures can be separated by simple physical methods.
Answered by
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Answer:
After he left the roof collapsed
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