We can never expect ________ bluer sky unless we create ________ less polluted world.
| A．a；a | B．a；the | C．the；a | D．the；the |
We all know that the Spring Festival is _____ special holiday when _______ whole family get together.
| A．the, the | B．a, a | C．the, a | D．a, the |
The tourists were struck by the beauty of _________ nature and then they stayed for _________ third day.
| A．the; the | B．/; a | C．the; / | D．/; the |
I think ___ good knowledge of English is ___ great help when you are traveling around the world.
| A．X，a | B．a，a | C．a，the | D．a，x |
I think it is _____ waste of time to play games on ____ Internet all day long.
| A．a ; a | B．the ; / | C． a ; the | D． the ; the |
—Stay a bit longer, it’s been such ________ fun having you.
—Thanks, anyway. I’ve got ________ early start tomorrow morning.
| A．/, the | B．a, an | C．/, an | D．the, an |