The answers are:
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4) [B]: his .
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5) Let us assume that the word in bold front is: "became".
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Based on this assumption, the answer is:
[A]: linking.
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In the sentence given:
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"The crowd became restless while waiting for the concert to begin." ,
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the word: "became" is a linking verb because it links the noun, "crowd", with the adjective, "restless".
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6) [A]: me.
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Note: To whom were the magazines returned? To "me".
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"Me" is the direct object (of the preposition, "to".).
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Hope this helps!