那只小狗一看到陌生人就开始叫。

The little dog started ___barking as soon as it saw a stranger.

教练在对队员们大声发号施令。

The coach was ___barking instructions at the players.

你想在零下20度去露营？你一定是疯了！

You want to go camping in minus 20 degrees? You must be ___crazy!