This is the second time I____the Himalayas as acollege student.[ ]

tried phoning her office，but I couldn’t ________.

Look! The students basketball. They often _________ it after school.

The old couple have been married for 40 years and never once ___________ with each other.

With the help of the new equipment, our factory produced _____ VCD players in 2009 as the year before [ ]