Three years goes by. Great changes have ________ in my school.

We should do what we can to save those _____ species, including the tiger, an animal which was considered _____ to humans.

He was very busy yesterday，otherwise he__________to the meeting.

The teacher asked the girl again, raising his voice a bit, but still_______no answer.

There is＿＿＿＿thing asfailure. Failure is just life trying to move us in another direction.