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If he ________(study)harder, he will do better．

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If Tom ________(come)to Nanjing, I ________(show)him around my hometown．

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If you keep ________(work)on the problem, you ________(solve)it soon．

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We should take some ________(act)to protect wild animals．

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How many ________(fox)are there in the forest?

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Many wild animals’ ________(live)areas are becoming farmlands．

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I am ________(true)sorry about it．

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Do tigers have good eyesight and ________(hear)?

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We hope the world will be ________(peace)forever!

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Some ________(hunt)kill bears for their paws．