The public transport system in Beijing is very good now, so there _____be any difficulty in traveling around the city.
The police were seeking more information to find out________ killed the rich merchant.
Had they known what was coming next, they _________second thoughts.
Studying Tom’s menu, I found that many of the items are similar to ________ of McDonald’s.
People who do not smoke have less ______of suffering from lung cancer than those who do so.
This factory produced much dirty water, which resulted in a wide _______ of environmental problems.