Dưới đây là đoạn văn đã điền từ thích hợp vào chỗ trống:

Ba likes sugar and **sweet** (1) things. He often has an ice-cream and a chocolate cake after meals, but he only cleans his teeth **once a day** (2). He doesn’t like going to the dentist. Yesterday, Ba went to see the dentist **because** (3) he had a terrible toothache. The dentist **filled** (4) his tooth and gave him some medicine. He also asked Ba many **questions** (5) about his food. The dentist told him not to eat **too much** (6) sugar and he should brush his teeth after meals.