Question

1. He'll settle down. Then his performance will improve
Once.
2. Although Judy was severely disabled she participated in many sports
Despite.
3. The instructions say you just add boiling water to the soup powder
The soup powder.
4. People who haven't been abroad shouldn't criticise foreign customs
Nobody who.
5. Simon hadn't expected that he would feel so weak after operation
The operation left.
6. It's nobody's fault that the meeting was cancelled
Nobofy..
7. I never intended to go to the meeting
I never had.
8. I was not surprised to hear that Harry had failed his driving test
It came.
9. The car was so rusty that it couldn't be repaired
The car was too 
10. Alan worked too hard at the office, and this led to his illness
Alan's illness

Answer 1

1. He'll settle down. Then his performance will improve
Once he has settled down, his performance will improve.
2. Although Judy was severely disabled she participated in many sports
Despite her severe disability Judy participated in many sports.
3. The instructions say you just add boiling water to the soup powder
The soup powder is said to be added boiling water.

4. People who haven't been abroad shouldn't criticise foreign customs
Nobody who who has never been abroad should criticize foreign customs.

5. Simon hadn't expected that he would feel so weak after operation
The operation left Simon feeling weaker than he had expected.

6. It's nobody's fault that the meeting was cancelled
Nobofy is to blame for the meeting being cancelled / for the cancel of the meeting
7. I never intended to go to the meeting
I never had any intention to go to the meeting.

8. I was not surprised to hear that Harry had failed his driving test
It came as no surprise to me that Harry had failed his driving test.
9. The car was so rusty that it couldn't be repaired
The car was too rusty to be repaired
10. Alan worked too hard at the office, and this led to his illness
Alan's illness  was the result of working too hard at the office