— No, it isn't. I think it's _______.

A: How nice to see you back, Li Lei!

B: Hi, Judy! I just came back yesterday.

A:____

B: Wonderful! I've been to many places of interest and I enjoyed myself in Disneyland.

A:____

B: Not really. Sometimes I got into trouble. They spoke too quickly and I couldn't have long conversations with the people there.____

A: Yes, I agree. I know English is very important, but I often feel sleepy in English classes.____

B: I'm afraid, too. And it's very difficult for me to remember new words.

A: Me, too. I don't know what to do____

B: Don't let these difficulties discourage(使气馁) you. Remember: where there is a will, there is a way.

A: Sure, I won't. I'll try my best.

B: So will I.

A. How was your trip?

B. At times I feel like giving up.

C. What did you buy in the USA?

D. I'm really afraid of the final exam.

E. I think I should work harder in English.

F. Could you make yourself understood in the USA?

如图，某数学活动小组为测量学校旗杆AB的高度，沿旗杆正前方2 $\sqrt{3}$ 米处的点C出发，沿斜面坡度i=1： $\sqrt{3}$ 的斜坡CD前进4米到达点D，在点D处安置测角仪，测得旗杆顶部A的仰角为37°，量得仪器的高DE为1.5米．已知A、B、C、D、E在同一平面内，AB⊥BC，AB∥DE．求旗杆AB的高度．（参考数据：sin37°≈ $\frac{3}{5}$ ，cos37°≈ $\frac{4}{5}$ ，tan37°≈ $\frac{3}{4}$ ．计算结果保留根号）

4.8×1.09≈____