It is known that ________ medical examination helps people to find out health problems as early as possible.

Having never met with such a _____ problem,he felt _____ and didn’t know how to solve it.

Travelling by plane is _________ than travelling by train.—Yes, but it is not so ___________ as travelling by train.

When did you _______ in Huang Zhou— On the morning of Oct. 1st.

What________you________now