1. This problem is difficult to solve.

　　2. I happened to go to the same place that day.

　　3. The new highway is expected to be opened to traffic next Monday.

　　4. The plan will be fulfilled in time. You may depend on that.

　　5. John, not Tom, is going to take over the business.
　　6. Prof. Smith's suggestion seems to be more practical.

　　7. To go or not doesn't make any difference.

　　8. I met Mr. Green. It was in the library, not in the lab.