Global warming ________ cause huge climatic changes and possibly a new ice age.

The population of Liupanshui is over 3 million.

I don’t know ________ the future holds in store for me, but I’ll face the storms of life bravely

(2013·陕西重点中学高三二模)We pursue happiness, thinking one day we will find it. But ________ it by seeking it.

Could you please tell me something about the two_________—- _____. They are exchange students of No. 1 MiddleSchool.