201. appear to have made a long awaited recovery
202. one …. The other
203. emerge in other procedures
204. be crucial in doing
205. a produce goods worth as much as those of b
206. either are now …. Or will be so within a few year… ( wrong: either now or within a few years will be…)
207. phenomenon in which
208. a dose more than merely summarize existing research…
209. assure sb of sth
210. not … nor…
211. by supporting
