4.Lisa hasn't been to Italy before.Neither has Helena.

5.The building is too high for me to go to the top without a clevator.

                                                                  Exercise 20

I.

1.It is very necessary to learn English.

2.The new hospital is smaller than the old one.

3.She has worked as a secretary for five years

4.Unless she works harder,she'll lose her job.

5.In spite of  being a poor student,Tom studied very well.

II.

1.They haven't delivered the parcel since no one was there to answer the door.

2.The second race isn't as easy as the first one.

3.It was so hot that we didn't leave the air-conditioned room all day.

4.I wish I had a car to travel around.

Ex19:

4. Lisa hasn't been to Italy before and neither has Helena.

5. The building is too high for me to go to the top without an elevator.

Ex20:                                                             

I.

1. It is very necessary to learn English.

2. The new hospital is bigger than the old one.

3. She has worked as a secretary for five years.

4. Unless she works harder, she will lose her job.

5. In spite of being a poor student, Tom studied very well.

II.

1. They haven't delivered the parcel since no one was there to answer the door

2. The second race wasn't as easy as the first one.

3. It was so hot that we didn't leave the air-conditioned room all day.

4. I wish I had a car to travel around