根据下列各句意思及所给单词的首字母或汉语提示，写出该单词的正确形式。
【小题1】I hope this summer holiday will be beneficial (有益的) to your study.
【小题2】He was the only witness ( 目击者) of the accident, who would give important information.
【小题3】Statistics indicate (表明) that the world population has doubled.
【小题4】Tom was elected (推选) chairman, for he is hardworking and responsible.
【小题5】Can you remend (推荐) a good dictionary to me ?
【小题6】I wonder if you’ll ccongratulate them all on their success.
【小题7】She had a strong ddesire to go abroad for further study.
【小题8】He was aaware of wind in his face.
【小题9】All the students pparticipated in cleaning the street.
【小题10】He oOwed his success to the good education he received.
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解析：
【小题1】此空放在系动词be后应填形容词beneficial。
【小题2】此空填名词。表示这事故的目击者。of 前后用名词。
【小题3】句意：数据表明、、、空格后面是that从句，且不缺成分，故填动词
【小题4】汤姆被选为主席，表示被动，放在系动词后面，elect要用过去分词。
【小题5】句意：你可以推荐一本好词典给我吗？情态动词后要用动词原形
【小题6】短语：congratulate sb. on/upon sth. 为某事向某人祝贺，句意为：为他们的成功向他们祝贺，will后面接动词原形。
【小题7】这里考查短语：has a strong desire to do sth. 表示很渴望做某事
【小题8】句意：他意识到风在他脸上。短语：be aware of sth/doing sth.
【小题9】动词 参加
【小题10】短语:把…归功于…owe sth to sb.