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1) Both light and heat _____ causes of the sofa's fading.

A) Was
B) Were
C) Is
D) Isn't

2) Physics ___ a very interesting subject to study

A) Is
B) Are
C) Were
D) Weren't

User Gakuo
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1 Answer

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For the first one the answer is B. The second answer is A.
User SiiilverSurfer
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