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选择填空,求解答~要具体过程~

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选择填空,求解答~要具体过程~
1.hurry up. mum___for us at home.
a.must wait b.must be waiting c.should wait d.should be waiting
2.can i open the windows at night?no,you______.
a.should better not b.whould better not c.had better not d.have better not
3.____you pass me a pen?i'd like to write down the telephone number.
a.should b.could c.need d.must
4.---why didn't you answer my call?---oh,i'm sorry,i_____.
a.must be bathing b.must have been bathing c.must be having a bath d.must have been having a bath
5.please tell jack______the rubbish everywhere.
a.don't throw b.don't to throw c.not throw d.not to throw
选择填空,求解答~要具体过程~
1.b 对现在情况的肯定推测 must be doing...肯定在...
2.c 婉言谢绝对方 had better no do...最好不要.
3.b.请求对方做某事的客气表达,比can更礼貌.Could you do sth?请你.好吗?
4.d 对过去情况的肯定推测 must have been doing 那时肯定在.
5.d tell sb to do sth的否定 tell sb not to do sth