Your voice is breaking up.
Please try these 4 steps one at a time:
1. Turn off your camera.
2. Turn off your incoming video (other students' video or teacher's video)
Click [Audio] and [Reconnect]
Mac users, click [File] and [Reconnect]
Click [ 。。。] and [Reconnect].
A) Click [File] on top left and select [Connection Speed].
B) Lower this to [Up to 1 mbps].
A) Select [ 。。。] and [Settings and Connections].
B) Add a checkmark in "My internet is slow" setting box.