A、No more visitors can be allowed in the exhibition hall. B、The exhibition hall can hold slightly over 250 visitors. C、500 visit

6. The Gardening Expo. was supposed to open tomorrow, but will be delayed until Friday, due to the bad weather conditions.
7. The closing of the textile factory, with two thousand workers being laid off, has doubled the unemployment rate in that town.
8. I can’t imagine why Mr. Nicholas hasn’t turned up yet. He was due for the board meeting before now.
9. Within the past century, scientists have been trying unsuccessfully to find a real cure for the common cold.
10. Twice as many tickets for the Auto Show could have been sold, but the exhibition hall has only a capacity for 500 visitors.