Over the past 40 years, 29 other Chinese people ____ Mount Qomolangma successfully.

The committee __ over the problem among themselves for two hours. 

--- Have you moved into the new office building?---Not yet .It ______

The first few years in the 21st century ______ the rapid rise of China as a world economic power.

Mary said they _____________________with each other for six years before they got married.