某生物兴趣小组就影响植物光合作用的因素进行了研究，获得如下图所示的实验结果。下列有关分析正确的是（  ）

读句子，选出正确的答语。

① What are you going to do? ____                 A. By train.

② When are you going?____                          B. Take a trip.

③ Where are you going? ____                        C. Yes, I am.

④ How do you go to the zoo____                    D. At 3 o'clock.

⑤ Are you going to use any books? ____        E. I'm going to Beijing.

用括号内所给单词的适当形式填空
（1）What a____ (please) it is for me to play the piano with you!
（2）Mother asked the Greens to help____(they) to some pears.
（3）Tim sings even____ (badly) than before.
（4）He felt____ (true) sorry for what he said.
（5）____ (clean) work is to make our city clean.