一、I think (18种) 二、develop (16种) 三、in fact (18种) 四、second (10种) 五、beautiful (20种) 六、because (15种) 七、achieve (15种) 八、in my opinion (10种) 九、first of all (14种) 十、important (5种) 十一、more and more (15种) 十二、solve (20种) 十三、or (12种) 十四、all in all (16种)