Choose the best answer.

Due to the Covid-19 pandemic, students could not go to school. They had to stay at home and study _______.

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The first-year students can take ______ an online course ______ an in-person course for this semester.

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According to the school rules, students _______ bring their smartphone to school except for their online classes.

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The students in this online class are not allowed to _______ social media while they are having a virtual lesson.

My sister is really interested in _______ software engineering and marketing, but _______ them sound great to me.

Find the mistake.

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To study online, students have to own a tablet or laptop connected to the Internet and make sure that the device is fully _______ before each lesson.