题目内容
根据句意及所给汉语写出单词的正确形式
George was ________(情绪不好，低落) at that time.
in, bad, mood
________ ________(根据) an ancient legend, the emperor discovered tea.
They ________ go to bed ________(直到……才……) 12 o'clock on Spring Festival Eve (除夕).
One day a customer in the restaurant where George worked ________(返回，送回) his plate of fried potatoes.
