Please tell me how the accident _________ . I am still in the dark.
— Shall Mary come to the concert with us? -Not_____she has finished her paper.
--- Won’t you go to Kathy’s wedding party?--- No, _____ invited.
---Did they tell you the final decision of the committee? ---No, they didn’t, but I think I ought to ______.
-Why didn’t Tom give you one of his paintings? -I didn’t want one,but he would have given me one if I______.
_________, the weather in America is different from place to place.