关于时态的选择题1.many old houses ______ to make room for the office

关于时态的选择题
1.many old houses ______ to make room for the office building.
A.are pulled down B.being pulled down
C.are being pulled down D.have pulled down
答案选择C,我不知道为什么A不行,都是被动语态啊,题目有没有的进行时的暗示,
2.it is sure that you ____ the college examination.
A.pass B.are passing C.passed D.will pass
第二题的答案是选D 我个人觉得选C也可以啊，请问为什么，