---How long did it _____ you to work out the difficult maths problems?
---I ______ about half an hour on it .
| A．take ; took | B．spend ; took |
| C．spend ; cost | D．take ; spent |
It is very _______ of you to speak in front of all those people .
| A．polite | B．honest |
| C．funny | D．brave |
---Do you often play computer games?
---No, And neither do ________ of my classmates, you know we are very busy
| A．three fourths |
| B．three four |
| C．third four |
| D．third fourths |
I don’t know _____ or not he will come . _______ he comes , I will call you .
| A．whether ; If | B．whether ; Whether |
| C．if ; If | D．if ; Whether |
The robot needs _______ once a month. And we will check it for you for free.
| A．to check | B．checked |
| C．checking | D．to checking |
