课堂练习时，专家型教师要求学生做作业时保持安静，并把这看做是课堂中最重要的事情。
参考答案：错
---How can you make such tea?
---Just let the leaves in the water of 75 for some time.
A．to remain
B．remain
C．to leave
D．fall
机械零件可以在超过抗拉强度的条件下工作。
for some time.