Be willing to "speak up" if problems arise. (Para. 6)
Meaning: Online students should be willing to ask questions if there are any.
arise: vi. to come into being, appear
When I was in great difficulties with my language learning, the opportunity for online learning arose. 当我在语言学习中碰到困难的时候，网上学习的机会来了。
A strong wind arose. 刮起了一股强风。