2. Complete the sentences using the text:
1. The potential difference must be maintained by …
2. Materials that offer slight opposition are called …
3. The best insulators are …
4. There are various kinds of electric circuits such as …
5. We “open” the circuit when …
6. We “close” the circuit when …
7. The “short” circuit is produced when …
8. A fuse is …

1. cheap - cheaper - the cheapest

2. far - farther - the farthest (further - the furthest)

3. hot - hotter - the hottest

4. cheerful - more cheerful - the most cheerful

5. pretty - prettier - the prettiest

6. red - redder - the reddest

7. noisy - noisier - the noisiest

8. terrible - more terrible - the most terrible

9. late - later - the latest (late - latter - the last)

10. bad - worse - the worst

11. difficult - more difficult - the most difficult

12. few - fewer - the fewest

13.old - older - the oldest (old - elder - the eldest)

14. sleepy - sleepier - the sleepiest

15. thin - thinner - the thinnest

Dear Mr. Jacobs,

Thank you very much for your letter of 5 March. In answer to your  request, we have pleasure in enclosing our latest catalogue and price list.  I would like to draw your attention to the special offers. These products are available at a reduced price for a limited time only.  If you would like any further information, please get in touch with me.  I look forward to hearing from you.

Yours sincerely,

Howard Johnson

Sales Manager

Enclosed: catalogue, price list, special offers supplement.