During colonial days, a school room looked rather empty.

(correct the sentence)

Quebec rises in a magnificent way above the St. Lawrence River.

= Quebec rises magnificently above the St. Lawrence River.

If I would have known about the team tryouts, I would have signed up for them.

= If I had known about the team tryouts, I would have signed up for them.

If he would have revised his first drat, he would have received a better grade.

= If he had revised his first drat, he would have received a better grade.

Valarie claims that cats made the best pets.

= Valarie claims that cats make the best pets.