Please tell answers for all 4

1. To make a comparison.

4. To suggest how one event relates to another.

Explanation:

On the contrary, compares two different things as different or opposite.

Example:

This flower smells amazing. On the contrary, this other one doesn't.

As a result, suggest the result or output of something, therefore, suggesting how it relates.

Example:

I was walking down the street when I tipped on a rock. As a result, I was injured.

"On the contrary is used to make a comparison. On the contrary, as a result, is used to suggest how one event relates to the other. As a result, you will get this question right"

On the contrary - To suggest how one event relates another

After dinner - To indicate a shift in time

Back at the hotel - To show a change in location

As a result - To make a comparison

(The last one i'm not so confident about it being right so sorry if it's wrong)

Most of us have no idea of the many ways in which the sunlight affects us. For example, sunlight destroys fungi, bacteria that may have settled the skin. The action of sunlight on the skin forms a substance which contracts the blood vessels of the skin and thus, raises the blood pressure.