（2017·江苏）The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _______ explanations are hard to find .
A. alternative B. aggressive
C. ambiguous D. apparent
-- Bob! How is your project? I heard you started it last Friday, right?
--Oh! I ______ for it. But I haven’t decided when to do it.
A. will prepare B. had prepared
C. have been preparing D. was preparing
--Our company had a hard time last year.
--But we managed ______. Now everything is progressing steadily.
A. moreover B. meanwhile
C. somehow D. therefore
I was__________ about it. I thought you were responsible and that’s why I scolded you. Please forgive me.
A. curious B. worried
C. particular D. mistaken
（2018·江苏）Try to understand what’s actually happening instead of acting on the _______ you’ve made.
A. assignment B. association
C. acquisition D. assumption
A healthy life is frequently thought to be ______with the open countryside and homegrown food.
A. tied B. related
C. classified D. associated
