I have a friend. When I am in trouble, it can help me. When I do my homework, it a_________ stays nearby. When I do not know how to read or w________ the words, I can ask it for help. When I do not know what the w__________ means, I can ask it for help, too. It is a wise man. But it can not t________. All the students should have one at home because it is a very u___________ tool (工具) for us. Do you know what it is? Yes, it is our silent teacher-dictionary.
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