IV.

16. They were walking the park when it started to rain.

    (When ở đây có mẫu : When +  simple past ,past continuous )

17. For me , the Internet is one of the best inventions in modern life.

   (Ta có mẫu của so sánh hơn nhất : S + tobe + the + adj + EST + in/of/on + N)

18. I saw your Institute's advertisement on TV program last night.

   (last night -> thì quá khứ đơn -> Mẫu : S + Ved ...)

19. I am interested in learning English and I would like to get information from the Institute.

 (S + tobe + interested/interesting in + Ving....

  S + would like + to V...)

20. I would like to improve my reading and writing.

 ( S + would like + to V...)

we were walking in the park when it started to rain.

For me, Internet is a wonderful invention of modern life.