(2013·齐鲁名校二模)Though the suspect refused to admit that he had stolen the    precious diamond at first,  he ________ and admitted    everything when he was shown the videotape.

If you want to catch your flight, you’d better ____ for the airport right now. 

Rather than ________ on a crowded bus，he always prefers ________ a bicycle.

Dr.King won the Nobel Peace Prize in 1964 for his achievement and________.

There is a new problem involved in the popularity of private cars ________ road conditions need ________.