下列与“桐花万里丹山路,雏凤清于老凤声”所蕴涵的哲理相同的是
This old professor insisted that he _____energetic enough and that he _____.
The living room is clean and tidy, ________ a dining table already laid for a meal to be cooked.
Scientists say it will be five or six years ________ it is possible to test this medicine on humans.
You are students in the No.168 Senior High School now, but you _______ in different junior high schools for three years.
Being injured in the leg made _______ impossible for him to walk his way home.