How can I know whether this sentence is in the passive voice when the preposition by is missing? Since my tutor instructed me to convert this sentence (which were assumed to be passive voice) into active voice. The sentence reads, " Freedom of speech will be curtailed if Facebook is shut down ". I don't know whether this sentence is active or passive voice. Can I have an answer to this?

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GATE 2017 exam is just 2 months away and if you have made up your mind to score high then start your preparation right away, without losing any time. Working hard and managing time well is essential to get you through the GATE exam, and to get into a reputed institute for your post-grade engineering/architecture/technology...

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GATE is an all-India entrance exam designed to test a candidate’s understanding of different undergraduate subjects in Engineering and Science. GATE score is used to select students for admission in various post-graduate education programs e.g. Master of Engineering, Master of Technology and Doctor of Philosophy, in Indian...

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