comma or semicolon assessment

I could spend the night at my best friend’s tonight, or I could go to the movies with my family.

• correct

• tonight; or

• tonight, but

I realized at once that something was wrong I was not, however, the only person who was concerned.

• correct

• wrong; I

• not; however,

He’s only two and a half years old, but he’s the biggest in his class.

• correct

• old; but

• old but

His work may be almost totally forgotten but he would certainly be surprised to see how much current scholarship simply echoes his ideas.

• correct

• forgotten, but

• forgotten; but

The snowstorm dumped twelve inches of snow on the interstate subsequently, the state police closed the road.

• correct

• interstate;

• interstate,

He cannot play the piano, nor can he play the violin.

• correct

• piano; nor

• piano nor

The hill was covered with wildflowers it was a beautiful sight.

• correct

• wildflowers; it

• wildflowers, it

Lucy played in the rain yesterday, so she got sick.

• correct

• yesterday so

• yesterday; so

Lucy played in the rain yesterday, and got sick.

• correct

• yesterday and

• yesterday; and

I went to the store and bought some plates.

• correct

• store, and

• store; and