1. You must show your passport before checking in.
required
You your passport before checking in.

2. His worrying so much was unnecesary.
needn't
He so much.

3. Apparently her husband was a secret-service agent.
known
Her husband is a CIA secret-service agent.

4. Ricky never thought of asking her daughter for advice.
occurred
her daughter for advice.

5. You must do exactly what she instructs you to do.
carry
You must exactly.

6. I intend to collect all the money I need somehow or other.
or
One I intend to collect all the money I need.

7. Sheila has read all of his books but one.
that
There is only Sheila has not read.

8. A number of flights had to be cancelled owing to the storm.
led
The storm a number of flights.

9. Louise doesn't know all the answers, though she pretends to.
acts
Louise all the answers.

10. Daniel broke his leg, and also dislocated his wrist.
but
Not only also dislocated his wrist.