Sentence 1:
* Correct answer: D. are grown
* Explanation: This sentence is in the present tense, indicating a general truth or habitual action. The passive voice is used here because the focus is on the flowers being grown, not on who is doing the growing.
Sentence 2:
* Correct answer: B. was started - completed
* Explanation: Both actions, "starting" and "completing" the construction, happened in the past. The passive voice is used for both actions because the focus is on the tomb, not on who did the building.
Sentence 3:
* Correct answer: C. were restored - attracted
* Explanation: Both actions, "restoring" and "attracting," happened in the past. The passive voice is used for both actions because the focus is on the towers and the tourists, not on who did the restoring.
Sentence 4:
* Correct answer: A. wasn’t done
* Explanation: This sentence is in the simple past tense, indicating a completed action in the past. The passive voice is used because the focus is on the homework, not on who didn't do it.
Sentence 5:
* Correct answer: B. was sent
* Explanation: This sentence is in the simple past tense, indicating a completed action in the past. The passive voice is used because the focus is on the letter, not on who sent it.