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 _____________(有益的) to your study.
小题2:He was the only _____________( 目击者) of the accident, who would give important information.
小题3:Statistics _____________(表明) that the world population has doubled.
小题4:Tom was ___________(推选) chairman, for he is hardworking and responsible.
小题5:Can you _____________(推荐) a good dictionary to me ?
小题6:I wonder if you’ll c_________________ them all on their success.
小题7:She had a strong d_______ to go abroad for further study.
小题8:He was a_________ of wind in his face.
小题9:All the students p_______________ in cleaning the street.
小题10:He o________ his success to the good education he received.
小题1:beneficial
小题2:witness
小题3:indicate
小题4:elected
小题5:recommend
小题6:congratulate
小题7:desire
小题8:aware
小题9:participated
小题10:Owed
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 * * ，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.