I'm now watching the Green Book. I'm now watching Green Book.

Since it's the last class before test, our teacher showsed a movie to us. Since it's the last class before test, our teacher showed a movie to us.

It happened in the past

Since it's the last class before test, our teacher showsed a movie to us. Since it's the last class before test, our teacher showed a movie to us.

Since it's the last class before the/a/our test, our teacher is showing us a movie to us. Since it's the last class before the/a/our test, our teacher is showing us a movie.

"the test" if you're emphasizing that this is an important test, or if it's a test you've mentioned before. "a test" if it's just one test of many that you don't feel the need to emphasize the importance of. You could also say "our test."

What impresses me most is thate Christmas eve and the warm light on the streets, I think I canwill remember that scenery forever. What impresses me most is the Christmas eve and the warm light on the streets, I think I will remember that scenery forever.

Or the scenery is already embed in my memory.

What impresses me most is thatare the scenes of Christmas eEve and the warm light on the streets, I think I canould remember that scenery forever. What impresses me most are the scenes of Christmas Eve and the warm light on the streets, I think I could remember that scenery forever.