| 1 | These two sentences are closely connected. | |
| 2 | He concentrated his attention on the question of technology. | |
| 3 | You will solve the problem if you concentrate upon it. | |
| 4 | Quality of concrete depends on proper placing, finishing, and curing. | |
| 5 | "We care rider's safety" is the key value in every Sate-Lite bicycle reflector. |
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