Similar words: near to, earth, earthquake, nearly, nearby, far and near, not nearly, heart. Meaning: adv. used with question words to convey surprise.
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151. What on earth had Hugh Puddephat done to provoke such passionate hatred in this well-mannered woman?
152. She wondered what on earth he could be getting at.
153. The arrangement of the oceans in relation to the continents plays a decisive role in creating and sustaining life on Earth.
154. Epicurus had a mundane philosophy yet despite suffering intense pain of the intestines, he enjoyed a blissful last day on earth.
155. Where on earth was he to get the funds for Paris amusements?
156. Not for the first time in the last twenty-four hours Kate wondered what on earth had happened to her child.
157. But Von Daniken, like others of his creed, believes that evidence of spacemen already exists on Earth.
158. It is one of the wilder places on earth and contains rainforest, and boa constrictors.
159. The largest accessible source of helium-3 on Earth is from the decay of tritium in hydrogen bombs.
160. So unless we become the agents of our own destruction, we have hardly begun our allotted span on Earth.
161. Being humble means recognizing that we are not on earth to see how important we can become, but to see how much difference we can make in the lives of others. Gordon B. Hinckley 
162. Unlike on Earth, most of the visible features on the Moon are circles or great arcs constituting parts of circles.
163. Pulling no punches, he asked Vincent what on earth had possessed him to behave so grotesquely.
164. And Mains sat and wondered what on earth was going on.
165. It might have been an airport beacon back on Earth, and he stared at it with a tightening of the throat.
166. A dried cornflower ... How on earth did all this rubbish get into the file?
167. He served for five years in some ofthe harshest conditions on earth.
168. Doubts came rushing in as she stared at her reflection, wondering what on earth had possessed her to buy it.
169. I mean, if the relationship can't survive the long term, why on earth would it be worth my time and energy for the short term? Nicholas Sparks
170. Even before Urquhart could demand to know what on earth he thought he was doing, the babbling commenced.
171. This is more than the total explosive energy of all the nuclear weapons on Earth.http://sentencedict.com
172. Without oxygen animal life on earth would not be possible.
173. It's a funny thing that when a man hasn't anything on earth to worry about, he goes off and gets married. Robert Frost
174. Thus, with the exception of water, all of the most popular beverages on earth contain either caffeine or alcohol.
175. What on earth was she now what trend or fad was she fastening on?
176. On earth, too, the deities were exceedingly and humanly attractive.
177. The cheetah's long flowing strides make it faster than any other animal on earth.
178. And the handsomest Celt on earth kneels before me while I sit snugly in the big armchair, the best armchair.
179. This organism could reveal much about the evolution of early life on Earth.
180. People have always been curious about exactly how life on earth began.
More similar words: near to, earth, earthquake, nearly, nearby, far and near, not nearly, heart, at heart, by heart, give ear to, heart and soul, year after year, neat, sneak, one another, beneath, one after another, north, fourth, worth, northern, worthy, northeast, for the rest, over there, be worth, other than, come forth, call forth.