Some scientists say that the tomato is technically a fruit，＿＿it is eaten as a vegetable

I called you at about half past eight last night but nobody answered—–Oh, I _____ in my office at that time

Jumping out of ________ airplane at ten thousand feet is quite ________ exciting experience.

t comes to my hobbies, I like rockclimbing______

(2013·潍坊高考模拟)Air pollution is getting more and more serious，so we must take action________it is too late