(B.) protect 21 __ species have been saved thanks to community efforts. A. dangerous B. endangered C. generous D. natural A . practical B. global 23. Environmental pollution is becoming an C. endangered D . serious __ serious problem that needs to be taken care of as soon as possible. A . increasingly B. increasing C. increase D. increased 22. Air pollution is a __ problem in many major cities. 24. Awareness of environmenta damage from __ bags is growing. A. simple-use B. single-uses C. single-use D. single-used 25. They announced an analys is of the carbon __ of leading companies. A. spaces B. contents C. emissions D. footprints 26. Don't worry. I __ you if I arrive home. A. phone B. would phone C. phoned D. will phone 27. Dad allowed Dora __ to the party. A. going 28. B. to go C. go D. gone __ his age, Mr. Brown went climbing the top of the Mount Fansipan in SaPa. A. Although B. Despite C. In spite D. However 29. I __ my homework as soon as I come home. A. have finished B. is finishing C. finish D. will finish 30. Laura promises __ us some handmade biscuits next weekend. A. bring B. to bring C. bringing D. will bring 31.They make sure that the rooms in the city are __ , even the big ones. A. affordable B. afford C. affordability D. affording 32. I'm learning English __ I want to get a good job after school. D. therefore A.but B. because C. so 33. You'll be able __ it yourself when you are older. D. did A. do B. doing C. to do 34. They __ a movie when their friends called. C. to watch D. watch A. watched B. were watching 35. My mom __ dinner at seven o'clock yesterday evening. C. is cooking D. was cooking A. were cooking B cooked 36. Nowadays,people enjoy a more __ lifestyle due to advancements in technology and healthcare B. comfortable C. comfortably D. A. comfort 37. I wish my friends spent less time __ computer games and more time outdoors. A. play B. to play C. played D. playing hnational and regional festivals.

21. **B. endangered:** The sentence refers to species that are at risk of extinction. "Endangered" is the correct term to describe such species.<br /><br />22. **D. serious:** The sentence describes air pollution as a significant problem. "Serious" accurately reflects the gravity of the issue.<br /><br />23. **B. increasing:** The sentence indicates that environmental pollution is growing. "Increasing" is the present participle form, correctly showing an ongoing process.<br /><br />24. **C. single-use:** The phrase refers to bags used only once. "Single-use" is the correct adjective form.<br /><br />25. **C. emissions:** The sentence discusses the release of carbon into the atmosphere. "Emissions" is the correct term for this.<br /><br />26. **D. will phone:** This is a future tense sentence indicating an action that will happen after a condition is met. "Will phone" correctly expresses this future action.<br /><br />27. **B. to go:** The verb "allowed" requires an infinitive ("to go") to complete the sentence grammatically.<br /><br />28. **B. Despite:** This preposition correctly shows contrast between Mr. Brown's age and his accomplishment.<br /><br />29. **D. will finish:** This sentence describes a future action that will happen after another action (coming home). "Will finish" correctly expresses this future action.<br /><br />30. **B. to bring:** The verb "promises" requires an infinitive ("to bring") to complete the sentence grammatically.<br /><br />31. **A. affordable:** The sentence describes rooms that are reasonably priced. "Affordable" is the correct adjective.<br /><br />32. **B. because:** This conjunction correctly shows the cause-and-effect relationship between learning English and getting a good job.<br /><br />33. **C. to do:** The verb "able" requires an infinitive ("to do") to complete the sentence grammatically.<br /><br />34. **B. were watching:** This sentence describes an action in progress when another action interrupted it. "Were watching" is the past continuous tense, correctly showing this.<br /><br />35. **D. was cooking:** This sentence describes an action in progress at a specific time in the past. "Was cooking" is the past continuous tense, correctly showing this.<br /><br />36. **B. comfortable:** The sentence describes a lifestyle characterized by ease and convenience. "Comfortable" is the correct adjective.<br /><br />37. **D. playing:** The preposition "time" requires a gerund ("playing") to complete the sentence grammatically.<br />