Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
____ we know now, oceans cover more than 70 percent of the earth.
We must teach her a good lesson ___ she likes it or not.
We don't know ___ to pay a visit to the old town.
The question __ we will hold the sports-meet next Sunday will be decided very soon.
We were very much surprised at the way ___ she treated the old woman.