Correct or incorrect sentence?

Susie’s stomach was growling so she decided to eat lunch.

• correct

• incorrect

While the orchestra warmed up, the house manager briefed the ushers on the seating arrangements.

• correct

• incorrect

All of our closest friends said they had cast their votes for him, but he didn’t even come close to winning.

• correct

• incorrect

Every student in the class.

• correct

• incorrect

Even though the karaoke machine wasn’t working.

• correct

• incorrect

Since he had already broken his arm twice, Jeff wore an arm brace when he performed heavy labor.

• correct

• incorrect

Vanessa and Corina had planned to spend their vacation swimming and beach combing, so they did just that.

• correct

• incorrect

Would be elected class president.

• correct

• incorrect

Instead of driving to the conference alone, I decided to join the others on the bus.

• correct

• incorrect

If I went to sleep.

• correct

• incorrect