You’d better go over your test paper carefully, _______ you won’t get a good mark.

It is only with the help of scientific research _____ bring PM1 air pollution under control.

We give dogs time, space and love we can spare, and _______, dogs give us their all.

_______cool it is to take a photo with little Cindy!The lovely girl in the program called “Where’re we going, Dad!”

The thirteen stars on the flag _ the thirteen colonies that announced independence first.[ ]