During the charity walk, people have to walk_____ country parks and_____ hills and mountains.

ou climb that tree, my boy— __________

He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.

29Internet，as well as newspapers and magazines，____an inportant part in our daily life

Tom’s father is so special that you can easily _____ him _____ in the crowd.