... but 23. She had to help her mother. … … … , she was often late for school. A. So B. Therefore C. But D. However 24. I did my best. … … … , it was not good enough. A. However B. Therefore C. ... although D. and 29. Minh had a terrible headache. … … … , he went to school. A. Therefore B. But C. However D. So 30. Tom has a bike, … … … he always walks to work. A. so B. but C. however ... Therefore 27. I am going shopping for food this evening … … I do not have to go at the weekend. A. so B. but C. however D. moreover 28. It was late, … … … I decided to phone home. A. however...