161. ______ owe much of their success as a group to their unusual powers of migration.

162. If teaching ___ more, fewer teachers would leave the profession.

163. The belief in life after death is prevalent in both primitive societies ___ advanced cultures.

164. It is usually ___ lava but gas that kills people during volcanic eruptions.

165. ___ the Gulf Stream is warmer than the ocean water surrounding it.

166. He worked ___ because he aspired to stand first in the examination.

167. Although we often use “speed” and “velocity” interchangeably, in a technical sense “speed” is not always ___ “velocity”.

168. Prices for bikes can run ___ Rs.3000.

169. The greater the demand, ___ the price.

170. A seventeen-year-old is not ___ to vote in an election.

171. ___ is necessary for the development of strong bones and teeth.

172. The examiner made us ___ our identification in order to be admitted to the test center.

173. This legend has been ___ from father to son.

174. By the twenty-first century, the computer ___ a necessity in every home.

175. ___ at 212 degrees F and freezes at 32 degrees F.

176. The bacteria in milk are destroyed when ___ to at least 62°C.

177. We were ___ by the result.

178. The laboratory has a ___ of equipment.

179. The general public ___ a large number of computers now, because prices are beginning to decrease.

180. He ___ a few steps when it started raining.

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