请帮我做几道英语题
一.介词填空：
Is that medicine ___ her.
二.用must,mustn't,can或can't填空
1.May I go there? No,you ___.
2.I ___ be off.Thank you very much for supper.
3.___ I stay up till midnight,please?
三.语法和词汇：从(a),(b),(c),(d)中选出正确答案
You mustn't get up ___.
(a)either (b)too (c)yet (d)still
参考答案:答案:一．for
二．1．mustn't/can't
2．must
3．Can
三．选(a)either 原因：either 用于否定句或疑问句；too 用于肯定句；yet用于现在完成时态；still一般用于一般现在时，而且在此语境当中不符合意思．