–Are you tired?-- _______. I can’t walk on a step farther and I am dying for some water.
A child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied________.
The policemen soon came to the________where the accident happened.
They are________to use chemical fertilizers in the field by law.
They're trying to________waste discharged by the factory for profit.
The food wasn't good, but________it was cheap.