用所给动词的适当形式填空。

1. You should always               (speak) English in class.

2. Why don't you               (write) down the correct words?

3. It's a good idea               (check) your vocabulary notebook.

4. How about               (listen) to the radio in English?

5. Try not               (translate) every word when you learn English.

6. Everyone should               (have) a pen friend.

（如图）一位25岁男性，双眼没有疼痛，角膜边缘变薄，上皮仍完整，变薄区有黄色的脂质沉着物，下列说法正确的是（）

A.该病最可能的诊断为边缘性角膜变性

B.应该尽早治疗

C.病变发展后期可导致明显的散光

D.男女发病率相同

E.是一种慢性感染性疾病