15.　　　 How I regret the hours wasted in the woods and fields!

14.　　　 Young as he is, he has learned advanced mathematics.

13.　　　 No sooner(Hardly) had he arrived at the theatre than(when) the play started.

12.　　　 Looking back upon those past years, he couldn’t help feeling very proud.

11.　　　 On the wall hang two pictures of famous scientists.

10.　　　 Sitting under the tree are Mr. Green and his first teacher.

9.　　　　　　 He lay on the grass, with his eyes looking at the sky and his hands under his head.

8.　　　　　　 What surprised me most was his imagination and patience.

7.　　　　　　 The professor was a humorous man with big nose and deep-set eyes.

6.　　　　　　 Wish you a pleasant journey back home!