giúp mik với ----- Nội dung ảnh ----- ``` Exercise 4. Put "a", "an" or "many / much" in the gaps. 41. My father works as ______ electrician. 42. It is cold because ______ heating system is broken. 43. Did you buy ______ pair of shoes yesterday? 44. She took ______ hamburger and ______ apples, but she didn't eat ______ apples. 45. James offered me ______ cup of coffee and ______ piece of cake. ______ cake is 46. This is ______ unique custom of this ethnic group. 47. No one in my family likes drinking ______ beer. 48. It took me ______ hour to finish my homework. Exercise 5. Make the questions for the following sentences. 49. The ethnic minorities in Vietnam often live in mountainous areas. ```