9. The system of water pipes has broken. The supply _____________.

A. will have reduced         B. will be reducing         C. will reduce                D. will be reduced

10. The air conditioner was very expensive, _____________ we couldn’t afford to buy it.

A. though                B. because                C. therefore                D. so

11. They are talking about the preservation of _____________ resources.

A. natural                B. nature                C. naturally                D. naturalize

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