2015年4月15日下午17时许，北京遭遇13年来最强沙尘暴袭击，城区被一片黄色覆盖，多个监测站点PM10小时浓度超过1000微克/立方米，达到重度污染。结合下图完成下面小题：

（1）计算：${\left(\sqrt{3}-2\right)}^0-\sqrt{27}+3\tan 60°$；

（2）先化简再求值：求（2x+y）（2x﹣y）﹣（2x+y）²+2y²的值，其中$x=\frac{3}{2}y=-\frac{1}{3}$．

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

Lori：Good morning, Chuck. Are you here____(wait) for Professor Johnson?

Chuck：Oh, yes. Good morning, Lori. The professor asked me to come here ____(have) an interview. Do you know something about the job as ____ teacher's assistant?

Lori：Oh, yes. I know all about it ____ Ihave work experience in this field. Last year, I did it for a long time.

Chuck：Really? How did you like ____？

Lori：Well, actually I think it was____(good) I had ever had at school. I was paid nine dollars an hour, which____(be) three dollars more than the school post office paid us.

Chuck：Yeah, I bet this is a good salary. But what did you do?

Lori：My responsibility was to help Professor Johnson grade the students' homework. It wasn't hard and the professor was always available ____ there were any questions. I ____ improve myself through doing this job.

Chuck：I think I would enjoy this kind of work. But I'm a little worried about how much ____ it might take.

Lori：Only about five or six hours a weekand you can do that in your room.

Chuck：It sounds good.

狒狒群体中担任“首领”的一般是雄性狒狒。