---__________ is it from here to Yangzhou Museum?
--- About 20 minutes by bike.
| A．How long | B．How often |
| C．How far | D．How soon |
—I’m sorry, sir. I’ve made lots of mistakes in the monthly exam.
— Never mind. ___________, the exam is a bit difficult.
| A．In all | B．Above all |
| C．After all | D．First of all |
—What can you see _________ the bridge, Millie?
—Oh, an elephant is standing over there. Let’s go and see it.
| A．across | B．through | C．above | D．Over |
— Must I turn off the gas after cooking?
— Of course. You can never be________ careful with that.
| A．enough | B．too | C．so | D．very |
---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.
| A．photo | B．voice | C．look | D．taste |
We can have ________ bluer sky if we create _________less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |