对下列各句中加点的字解释有误的一项是

Just use simple words and sentences and try ______ the meaning clear. Soon your speaking will improve.

What do you think of ____________ 8th China Flower Expo in our city— It was ____________ big success, I think.

Warm­bloodedanimals live an active life even in freezing winter，which helps them to ________ their normalbody temperature.

She was always ________, even when things were at their worst.[ ]