Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
Mike is a good boy. He often _________ to help his classmates.
Lao She is one of _____________ of the twentieth century.
__________ you go jogging, ___________ you will feel.
Let’s try to speak English as __________ as possible.
What’s _________ population of __________ capital of that country?