To answer the questions, let's analyze the pronunciation of each word.
Question 1:
The words "landed," "needed," and "wanted" all end in "-ed" and have the same pronunciation pattern (ˈlændɪd, ˈnidɪd, ˈwɔntɪd). However, "opened" has a slightly different pattern (ˈoʊpənd) with a schwa sound (ə) that is not present in the other three words.
Answer: C (opened)
Question 2:
The words "children," "machine," and "watching" all have a stress pattern where the stress falls on the first syllable (ˈʧɪldrən, məˈʃin is the only one where the main stress is on the second syllable but it has the same pattern with "machine", the rest of the word is unstressed, and the last part is stressed for "machine" but watching and children are stressed on the first syllable) or the word is partially stressed on the second part. However, "choice" has a different stress pattern and also the letters "ch" in children, choice and watching are pronounced differently (ʧɪldrən, ʧɔɪs, ˈwɑʧɪŋ). For "machine" and the other three words "choice" is the only one not ending with a suffix, the rest have a 2 or more syllables ending with an ing or a suffix. In the question, "choice" stands out with a "oice" ending (and a one-syllable word with the "oice" pattern), while the other three words end with "ildren," "achine," or "atching" and the rest of the word have more syllables than "choice" and the suffix and stress.
Answer: D (choice).
Analyze: 'business', 'grandparent', 'chocolate' are stressed at the first syllable. 'experience' is stressed at the second syllable.
Answer: B. experience
Analyze: 'beautiful', 'dangerous', 'wonderful' are stressed at the first syllable. 'terrific' is stressed at the second syllable.
Answer: D. terrific
Here are the answers to the given questions:
Question 5: C. that
Question 6: D. had been
Question 7: B. in
Question 8: B. although
Question 9: A. destroyed
Question 10: C. not to forget
Question 11: C. can
Question 12: A. had – would have bought
Question 13: D. work
Question 14: C. shall we
Question 15: B. keep in touch
For each sentence, I'll identify the error by circling the letter.
Question 16: The Chinese build the Great Wall over two thousand years ago.
Answer: B. build (It should be "built", the past tense of "build", to correctly form the sentence: "The Chinese built the Great Wall over two thousand years ago.")
Question 17: Many people believe that New York is the most great city in America.
Answer: C. most great (It should be "greatest", the superlative form of "great", to correctly form the sentence: "Many people believe that New York is the greatest city in America.")
Question 18: Mrs. Green’s children are used to be picked up after school every day.
Answer: B. are used to (It should be "are used to being" to correctly form the sentence in the present perfect passive construction, or more naturally: "Mrs. Green’s children are used to being picked up after school every day.")
19: B. It is said that he invented the digital camera.
20: A. We shouldn’t attempt to do this ourselves.