---- Flight 551 for Dallas ________. I must be off now. ------Have a pleasant trip then.

(2013·高考重庆卷)—It rained cats and dogs this morning.I’ m glad we took an umbrella.—Yeah，we would have got wet all over if we________.

In addition to what ________ above, his speech was also involved in some big issues of our society.

The hard life in the mountainous area he has adapted to ____ a real challenge to anyone. 

First aid is a temporary form of help       to someone who suddenly falls ill or gets       ——before a doctor can be found.