The global warming is more and more serious，for which human beings ________.

(2014·海口质检)I received his mother’s phone call at ten.Only then did I know that he was badly________in an accident the day before yesterday.

—What about the result of your final examination?—Not so bad. Not so good as my parents expected, ________.

The policeman asked him to identify the thief.

It ______ to me that I should go to attend a meeting when I was about to go home．