单选题大学英语

单选题大学英语
On snow days,you have to drive very __ to avoid traffic accidents.
A.cautiously B.nearly C.smoothly D.properly
我选的A
To the ___of the citizens,no one else was infected with HIN1 flu except the 12 confirmed cases
A.relaxation B.diappointmentC.relief D.suprise
我选的C 如释重负的意思?不行吗
I have not finished my homework yet.
Speed up!we will __you another twenty minutes.
A.allow B.leave 我选的B 为什么啊
In front of our house stands a tall tree,__top well above the tops of the other trees.
A.whose B.its 我选的A 为什么,its在这里是个什么成分不太明白
另外whose只能修饰人吗