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1 . Let a little song a________ to the ear, or a great book to the heart.（根据首字母单词拼写）
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2 . China is the only nuclear-weapon state that has unconditionally committed (承诺) itself not to use or ________ (威胁) to use nuclear weapons against non-nuclear-weapon states or nuclear-weapon-free zones. Can the US make such a commitment? （根据汉语提示单词拼写）
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3 . In this way, practicing day in and day out helped Stephen s ________ （磨练）his skills. （根据中英文提示填空）
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4 . Social media tools let us see what our friends are up to and __________ (维持)friendships without missing a beat．
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5 . If you don’t like the topic, let’s s_________ to another one.（根据首字母单词拼写）
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