Câu trả lời: 

28. When it started to rain, I was sitting on a bench in the park.

29. The concert was exciting at the beginning but it became boring at the end.

30. This smartphone was bought ( by my father) last year.

31. The security officer allowed me to enter the school to take my book. 

32. The last time I saw my father was 1 month ago . 

Chúc bạn học tốt nha :33 !!! 

For question 28 and 29,combine each pair of sentences into one as directed in brackets.

28. It started to rain when I was sitting on a bench in the park.

29. The concert was exciting at the beginning,  however, it became boring at the end.

 For question 30,31 and 32 finish each sentence in such a way that it means the same as the sentence printed before it.

30. This smartphone was bought by my father last year.

31. The security officer allowed me to enter the school to take my book.

32. The last time I saw my father was last month.