—Don't forget to protect your eyes well______ you take online classes.
—OK. Thank you, Sir.
句意：——如果你上网课，不要忘记保护好你的眼睛。——好的，谢谢您，先生。
考查连词。if如果；though尽管；as if好像。“you take online classes”是条件状语，用连词if引出条件状语从句，表示“如果”。故选A。
—Don't forget to protect your eyes well______ you take online classes.
—OK. Thank you, Sir.
_____ the outbreak of COVID-19 is a terrible blow to the country, the government is trying hard to bring the situation under control.
_______ you have problems, just let me know. I'll always be there for you.
We should protect the environment _______ we can make a better world to live in.
____ she is very young, she can take good care of herself.
________ Simon has done well in his studies, he still works really hard.
We will cause less pollution _________we can find ways to reuse or recycle more rubbish.
Many students hated to have classes on DingTalk, ________ they gave it one-star reviews（评价）.
______ he is dead, Kobe Bryant’s spirit will continue to influence us.
______ the traffic was heavy, we still got to the railway station on time.
