－Oh, my God! I can't find my key to the office.－Don't worry. Perhaps it _________ at your home.

Lots of trees ________in our city over the years. It is becoming greener and greener!

---- Drunken drive is dangerous, isn’t it? ---- Yeah. That why drunken drivers      to prison even without causing accidents.

 Much more attention should_______ when we have exams.

—Who ________ for the match?    —Sam and Ben.