The new-designed car is on show now. I wonder ______.
| A．how much it cost | B．how much it costs |
| C．how much did it cost | D．how much does it cost |
I took the wrong train _______. I didn’t even know it until half an hour later .
| A．by mistakes | B．by mistake |
| C．with mistake | D．with mistakes |
The mobile phone has influenced people’s life a lot since it ________.
| A．invents | B．invented |
| C．is invented | D．was invented |
--- I have trouble _______ my new computer.
---Don’t worry. I’ll show you how _______it.
| A．using; using | B．to use; to use |
| C．using; to use | D．to use; using |
–Do the Smiths live next to you? --No, but they____.
| A．used to | B．used to do it |
| C．used to be | D．used |
--- Would you like to play computer games with me?
--- Sorry, I have ________ playing them.
| A．made up | B．given up |
| C．looked up | D．picked up |