___________ is it from Guangzhou to Chaozhou

The concert by Lang Lang was so well ______ that all the tickets had been sold out on the first three days last month

The price of this computer is the_______ of the three.

I find _______ difficult to finish the work on time.We only have three hours left.

As a doctor, I _______ that I will be kind to my patients, love them and do my best to save their lives. That is my promise.