179. Can you think of a s_________ where “doing it alone” might be more important than teamwork?

178. The speaker r_______ his voice but still couldn’t make himself heard.

177.S_______ in my life have I met such a determined person as he.

176. These goods are t_________ to Japan by water not by land.

175. A s________ line is the shortest distance between two points.

174. In order to protect our environment, we mustn’t t______ away so much waste.

173. It was George Washington who led Americans to s______ for building an independent country.

172. The American t_______ in Iraq were reported to have a fierce fighting with the terrorists.

171. You should learn to speak in a friendlier s_______.

170. Three-quarters of the world’s s_______ is covered by water.

　　　　　　　　　　　　 Part 18: (page 171---180)