Don’t touch your eyes, nose and mouth, because they aren’t covered by skin and can _______ the virus more easily.
I have no idea __ the Greens has moved to Hangzhou or not.
---Is he here now?---No, I ___ he ___ here by now.
My brother tried ___, but still he couldn't work out this maths problem.
He seemed as if he ___ his homework when his mother came in.
The poster says that a writer and poet ___ to give us a talk on English next week.