网课期间,我们多数人作业都很认真.(do)
Most of us very carefully when we had classes online.
Hainan is in the (南方)of China.
In autumn, quite a few (树叶) turn yellow and fall off the trees.
Computers were (发明) not long ago, but they are very useful for us.
So far, (千) of people have died of COVID﹣19.
Could I (借) your dictionary?