That river is too* wide to swim across.

Here are the completed sentences: 21. That river is too* wide to swim across. "Too" indicates an excessive degree, making it impossible or undesirable to swim across. The correct option is D. too. 22. He called a few* girls to help in the kitchen. "A few" is used with countable nouns (girls) to mean a small, but sufficient, number. The correct option is A. a few. 23. I have known* Mr. Titus for many years. The phrase "I have" requires the past participle form of the verb, which for "know" is "known", forming the present perfect tense. The correct option is C. known. 24. We are happy to see an* ostrich dancing. "An" is used before words that start with a vowel sound, such as "ostrich". The correct option is B. an. 25. Work hard or* else you will fail your exams. "Or else" is a common conjunction used to introduce a negative consequence if the preceding action is not taken. The correct option is D. or. 26. Brian has a new bike. It belongs to him*. "Him" is the objective pronoun used to refer to a male person (Brian) as the recipient of the action or the object of a preposition. The correct option is C. him. 27. You ate more* bananas than me. "More" is used for comparison with both countable (bananas) and uncountable nouns. The correct option is A. more. 28. The dentist checked all her teeth*. "Teeth" is the irregular plural form of "tooth". The correct option is B. teeth. 29. They walked carefully* because the floor was slippery. "Carefully" is an adverb that describes how they walked, indicating caution due to the slippery floor. The correct option is D. carefully. 30. Nobody* heard the burglars break into the shop. "Nobody" is an indefinite pronoun meaning "no person", which fits the context of no one hearing the burglars. The correct option is C. Nobody. Here are the answers: 21. D. too 22. A. a few 23. C. known 24. B. an 25. D. or 26. C. him 27. A. more 28. B. teeth 29. D. carefully 30. C. Nobody That's 2 down. 3 left today — send the next one.