1. 很高兴收到你的来信。(receive)
I’m glad to receive your letter.
2. 感谢你在新冠肺炎疫情期间对我学习的关心。(concern, during the outbreak of)
Thank you for your concern about my study during the outbreak of COVID-19.
3. 我一切都好。
Everything is fine with me.
4. 我们每天有6节在线课程。(occupy)
Every day, we are occupied with 6 online lessons.
5. 这些课程都是我们省的优秀教师教的。(excellent)
These lessons are given by the excellent teachers in our province.