老师不在的时候,我们也能保持安静. We can keep quiet when the teacher ______ ______ .
问题描述：
老师不在的时候,我们也能保持安静. We can keep quiet when the teacher ______ ______ .
答
老师不在的时候,我们也能保持安静.
We can keep quiet when the teacher ______ ______ .
应填：is out
注：be out 外出；离开