If you are not happy with it, you should say it out. Don’t just ______ in silence.

I wonder how it ____ that Chinese climbers successfully finished the torch relay on the Mount Qomolangma, where the air is so thin.

The man ____ the stranger when he ____  suddenly .

—Do you know how I can ____ him?—On his mobile phone．

They see you as something of a worrier,__________ problems which don’t exist and crossing bridges long before you come to them.