._________alone in the large house, the little boy had to learn to survive by himself.
| A．To leave | B．Leaving | C．Left | D．Being left |
Pop music is such an important part of society ______ it has even influenced our language.
| A．as | B．that | C．which | D．where |
The little boy came riding full speed down the motorway on his bicycle. ______ it was!
| A．What a dangerous scene | B．What dangerous a scene |
| C．How a dangerous scene | D．How dangerous the scene |
With the help of high technology, more and more new substances ______ in the past 10 years.
| A．discovered | B．have discovered |
| C．had been discovered | D．have been discovered |
—Sorry, I made a mistake again.
— ______. Practice more and you’ll succeed.
| A．Never mind | B．Certainly not |
| C．Not at all | D．Don’t mention it |
We are living in ______ world of developing, ______ world where any problem can be solved in a peaceful way.
| A．the; a | B．a; the | C．the; the | D．a; a |