The children ______ in the field since morning. A. have been playing B. have being playing C. are playing D. were playing E. have played

here are the answers to the questions: 66. The sentence is "Simon and I climbed to the top of ______ mountain." The definite article "the" is used to refer to a specific mountain, which is implied when talking about "the top of" it. The correct option is B. 67. The sentence is "The train ______ before we got to the station." This sentence describes two past actions. The train's arrival happened before* "we got to the station." To indicate an action completed before another past action, the past perfect tense is used. The correct option is E. 68. The sentence is "One of the boys who ______ French in our class was away from school yesterday." The relative pronoun "who" refers to "boys" (plural). The verb in the relative clause should agree with "boys" and describe a habitual action or skill. Therefore, the plural present tense "speak" is appropriate. The correct option is C. 69. The sentence is "The children ______ in the field since morning." The phrase "since morning" indicates an action that started in the past and has continued up to the present moment. This requires the present perfect continuous tense. The correct option is A. 70. The prefix ______ can be added to 'biotics' to form a new word. The prefix "anti-" means against or opposite. When combined with "biotics," it forms the word "antibiotics," which are medicines that fight bacterial infections. The correct option is B. Drop the next question.