Choose the right sentence

Choose the right sentence
1. He wasn't convinced that she had committed the crime.
2. He didn't convinced that she had committed the crime.
3. He wasn't convinced that she had commit the crime.
Choose the right sentence
1. By the time the plane had been arrived, we had been at the airport for half an hour.
2. By the time the plane arrived, we had been at the airport for half an hour.
3. By the time the plane had arrived, we were at the airport for half an hour.
Choose the right sentence
1. When Dad had got back, the babysitter had left.
2. When Dad got back, the babysitter had left.
3. When Dad got back, the babysitter would had left.
Choose the right sentence
1. Kate's brother had taken his final exam by the time she left school.
2. Kate's brother took his final exam by the time she left school.
3. Kate's brother had taken his final exam by the time she had left school.
Choose the right sentence
1. The old lady on the plane had been too nervous as she hadn't flown before.
2. The old lady on the plane was too nervous as she hadn't flown before.
3. The old lady on the plane was too nervous as she didn't fly before.