─Daniel, doing homework all the time makes us feel bored (无聊). What about going out for a picnic ─ _______.

Warm­blooded animals live an active life even in freezing winter，which helps them to ________ their normal body temperature.

On his way to school, he was _____.

Many of the earth’s plants and animals have already ______ and several other species are endangered．

Shanghai is the first city in the world _____________ a high-speed maglev train，from the city to Pudong Airport．