用 must, oughtn't to, don't have to, mustn't, needn't或  have to填空。

1. You _____ go on working because you look so tired now.

2. The weather turned out to be fine yesterday. I ______ have had the trouble to carry my umbrella

    with me.

3. If you earn more than ~5,000, you _____ pay tax.

4. You ______ play now !  You shall finish your homework first!

5. You can't give up. You ______ try to get over the difficulties.

男性，61岁。3天前睡觉醒后发现视野范围缩小，神志清楚，血压正常，心脏正常，右侧同向性偏盲，言语正常，肢体肌力正常，感觉正常。

A．脑栓塞

B．脑血栓形成

C．脑出血

D．脑膜炎

E．蛛网膜下腔出血