... Unit 4: At school Period 21: Lesson (A1, 2, 4) A: What is studying? B: is studying A: What time does have class? B: has class at Unit 4: At school Period 21: Lesson (A1, 2, 4) A: What ... at Unit 4: At school Period 21: Lesson (A1, 2, 4) A: What is studying? B: is studying Math A: What time does have class? B: has class at Unit 4: At school Period 21: Lesson (A1, 2, 4) ... What time is it? 11 12 10 - It is nine thirty - It is half past nine Unit 4: At school Period 21: Lesson (A1, 2, 4) Vocabulary Physics: Môn Vật lý Physical education: Môn Thể dục Unit 4: At school...