I carried with me for years a vague模糊的____（印象） that he was a cold-hearted寡情的 man

To be qualified for the job, _____．

古希腊人常用小石子在沙滩上摆成各种形状来研究数。比如：

他们研究过图1中的1，3，6，10，…，由于这些数能够表示成三角形，将其称为三角形数；类似的，称图2中的1，4，9，16，…这样的数为正方形数。下列数中既是三角形数又是正方形数的是(    )

如图为某哺乳动物某个DNA分子中a、b、c三个基因的分布状况，其中I、II为非基因序列．有关叙述正确的是（    ）

阅读下面材料, 在空白处填入适当内容 (一个单词）或括号内单词的适当形式。讲答案填写在答题纸的相应位置。
       What's the most important thing for you to have in your life? Somebody ____ (mention)hard-work, others suggest knowledge, love and luck.
       If you arrange the 26 English letters alphabetically(按字母表的顺序)and use ____(number)to represent each of them, for example, 1 for a, 2 for b, 3 for c…, you can change an English word into a number. So hard-work becomes 8+1+18+4+23+15+18+11=98, meaning 98 is its mark; knowledge: 11+14+15+23+12+5+4+7+5=96, while love :12+15+22+5=54, and luck : 12+21+3+11=47, a small mark. None of these words can give one a full mark. What about money or prayer(祈祷)? They can't , ____.
       Then what else? Don't be worried. You can always find an answer ____a problem in your life, ____you change your way of looking at things or doing things, or your attitude. Yes, attitude is the word. See for____(you): attitude:1+20+20+9+20+21+4+5=100, a full mark.
       Different attitudes lead to different courses of life. Most times people hope for a better life. It is possible ____one will have a change for the better after one has ____(change)one's attitude.
       When you change your manner and became friendly towards others, you'll meet ____ (much)smiling faces towards you. In the same way, if you take a positive attitude towards failure, you'll find it's also rewarding ____it has caused you losses.