故答案是only.句意：每个年级只有一个班

【题目】首字母填空（10分）

I study at a primary school in a village in northern Jiangsu Province. There are 【1】o______ six classes in my school. That is to say， there is only one class for each 【2】g_____. All the classes are mixed ones. There are fifty-one students in my class. Twenty-six of them are 【3】b______ and twenty -five of them are girls. There are only three teachers in our school ad each of them has to 【4】t______ two classes. All the teachers have to teach different subjects and they have to take turns to look after the school at night.

Most of the students walk to school and walk 【5】h______ every day. Only a few students have bikes and I am one of them . My bike is not very new， but I find it very【6】 u_______ .I do not ride my bike when it rains because the road gets very muddy . Sometimes， my classmates borrow my bike to practise 【7】r______ it. After school， we often play on our way home . Sometimes it is already dark when we【8】 g______ home， My classmate ， Liu tao， has a computer at home. We often go to his home to【9】 p________ computer games. Last week I asked my father to buy a computer for me， but he said he did not 【10】h_______ enough money. He also said that a student should not spend too much time playing computer games .