First of all, please _____ me to introduce myself to you．

 He________ to get a high position in the company, but failed because of his carelessness.

— You know what? Tom wants to be a politician after graduating from college．— Are you kidding? He will never _____ a person like that．

Whoever leaves the room last must ______ that all the lights are turned off.

The problem, according to the experts, is _______ we should do with the salty land.