几道选择题,对选择理由请稍作解释

几道选择题,对选择理由请稍作解释
There is a police car in front of his house,what do you suppose______to him?
A. happens B.has happened
The water will be further polluted unless some firm measures______
A. will be taken B.are taken C. were taken D.had been taken
No permission_____for anybody to enter the building.
A.has been given B.was given c. will give D. is giving
We______the star for an hour,but he ______ yet.
A. have waited for;hasn't come B.have waited for;doesn't come C.have been waited for;doesn't come D.have been waiting for;doesn't come
最后一题的最后一个选项应该是 D.have been waiting for;hasn't come