..Q1. Is it correct to say?
Why are you dragging the wrapper with your foot?
Please don't drag the wrapper with your foot.
Students, look into your notebooks. "..look in..."
After storming at the students, he made a hasty exit.
After storming at the students, he withdrew from the room. but the other sentence is much better.
I do not want to dishearten the students.
If you write with this pen, the ink smudges a lot.
It's difficult to instil interest as it should develop in a student spontaneously. ok - but not good. It is difficult to instil interest in a student as it should develop spontaneously.
I had assigned some worksheets for practice for each concept explained. For practice, I have assigned some worksheets for each concept explained.
Q2. What does virtual mean?
virtual conversations in a chatroom. = Computing not physically existing as such but made by software to appear to do so
the virtual extinction of the buffalo. = almost as described, but not completely or according to strict definition.
Q3. What is the difference between respond and react? Respond = to say or do something in answer; React = to respond to something.
These are good examples of where the underlying concept is subtle. Generally I would say that "respond" is a verbal reaction, and "react" is a physical one.
Student or Learner