单项选择题
Tom and Ben have（）again and stop talking to each other.
A. fallen in B. fallen out C. fallen through D. fallen up
单项选择题 With high hopes, the company sent samples of the substance to scientists, but they couldn't（）any practical uses for it
单项选择题 As the pressure（）the liquid rock is forced up through channels in the resistant rock to the earth’ s surface.
