Is it convenient to use dollars in Singapore? Do I need to change US dollars into Singapore dollars? Is it far from Lehe Road to Orchard Road?

The dollar is almost universal, including an international metropolis like Singapore.

In Singapore, shops generally don't refuse US dollars, but they will change the change into Singapore dollars for you, of course, after the exchange.

If you want to change new RMB, you can change it at the exchange point at the local airport, and some hotels also have exchange services.