This is______ difficult problem that few students can work it out.
— Must I turn off the gas after cooking?— Of course. You can never be________ careful with that.
---Can you describe what Mr. Green's daughter is like?--- Oh, she has the very_______ of Mr. Green. I'm sure you can know her at the first sight.
We can have ________ bluer sky if we create _________less polluted world.
The park is far away from here indeed.It’s about _________walk.
Mr.Green,do you know ____________________?----July10.It will last a month.