1. B. books Explanation: The underlined part in "books" (/ʊ/) has a different vowel sound from the other words (/ɛ/ in "pencils", "tests", and "picnics").

2. D. bad Explanation: The underlined part in "bad" (/bæd/) has a different vowel sound from the other words (/eɪ/ in "hate", "cake", and "late").

3. C. apple Explanation: The primary stress in "apple" falls on the first syllable (/ˈæp.l̩/), whereas in the other words, it falls on the second syllable (in-ˈvent, ˈstu.dent, ˈbook.shop).

4. D. cover Explanation: The primary stress in "cover" falls on the first syllable (/ˈkʌv.ər/), whereas in the other words, it falls on the second syllable (con-ˈtain, ex-ˈpress, o-ˈbey).

5. A. buyings Correction: Susan forgot to buy some bread on the way home, so she is hungry now.

6. C. on Correction: Mary enjoys doing aerobics in the morning to keep healthy.

7. A. discovered Correction: Son Doong Cave was discovered by Ho Khanh, a local man in Quang Binh Province, in 1991.

8. B. lately Correction: Peter came to class late, so he missed the first lesson.

Mark the letter A, B, C or D to Indicate the underlined part that needs correction in each of the following questions.

5. Susan forgot buyingsome bread on the way home, so she is hungry now.

A. buying                    B. some                       C. on                           D. so

6. Mary enjoysdoing aerobics on the morning to keep healthy.

A. enjoys                     B. doing                      C. on                           D. to keep

7. Son Doong Cave discoveredby Ho Khanh, a local man in Quang Binh Province in 1991.

A. discovered              B. by                           C. a                              D. in

8. Peter came to class latelyso he missed the first lesson.

A. came                       B. lately                       C. so                            D. the