Solve questions 68-75.

Step 1: Solve questions 68-75.

• 68. The correct sentence structure is Subject + Verb + Object + Adverb of time. "He" is the subject, "plays" is the verb, "football" is the object, and "every Sunday" is the adverb of time. $$\boxed{\text{A. He plays football every Sunday.}}$$
• 69. The correct sentence structure is Subject + Verb + Object + Adverb of time. "We" is the subject, "visited" is the verb, "the museum" is the object, and "yesterday" is the adverb of time. $$\boxed{\text{D. We visited the museum yesterday.}}$$
• 70. The correct grammatical structure for this sentence is Subject + auxiliary verb + adverb + main verb + object. $$\boxed{\text{B. She has already finished her homework.}}$$
• 71. Proper nouns, such as place names like "Adama," must be capitalized. $$\boxed{\text{B. My brother lives in Adama.}}$$
• 72. To show possession for a plural noun ending in 's', an apostrophe is added after the 's'. "Boys'" indicates that the shoes belong to multiple boys. $$\boxed{\text{C. The boys' shoes are dirty.}}$$
• 73. A colon (:) should be used to introduce a list of items. $$\boxed{\text{B. Bring the following items: pens, pencils, and rulers.}}$$
• 74. The correct spelling of the word is "environment." $$\boxed{\text{A. environment}}$$
• 75. The correct spelling of the word is "knowledge." $$\boxed{\text{C. knowledge}}$$