用custom,habit, practice和usage填空,并把句子翻译成汉语。 |
①It is a good _________to eat and sleep regularly. 翻译:_________________________________________________ ②Social________ vary in different parts of the world. 翻译:_________________________________________________ ③It's his _________to furnish references to all his quotations. 翻译:________________________________________________ ④_________determines what is good English. 翻译:________________________________________________ |