. The visitors have to be picked up from the airport.

2. I should be told about these changes earlier.

3. Luckily Jim didn't need/have to take the exam again.

4. In the end all I could do was to get a lift with a colleague.

5. By law, seat- belts have to be worn by all rear-seat passengers.

6. Strange as it may seem I like stake cake.

7. The animals are not allowed to be fed by visitors to the zoo.

8. He should have told us his new address. 

9. Alice must have been embarrassed. 

10. The notice says the forms have to be signed twice.

`Ex1:`

1. The visitors have to be picked up 

2. I suggest they should tell me

3. didn't need to re-take 

4. I could do was 

5. Have to be worn by

6. As it may seem

7. Must not be fed

8. Should have told us 

9. Must have been

10. Must be signed