The boy asked his father ______________________ .
| A．where it happens | B．when did it happen |
| C．what did it happen | D．how it happened |
This piece of music is ________________ that one.
| A．as boring as | B．not as boring than |
| C．more bored than | D．so boring as |
Sally asked________________________.
| A．how could she get to the zoo. | B．how she can get to the zoo. |
| C．how she could get to the zoo. | D．where was the zoo. |
_______ the boy was walking down the street, the UFO landed.
| A．While | B．After | C．Before | D．until |
My friend has the same haircut __________ I do.
| A．as | B．like | C．seem | D．looks like |
Some scientists think that it may take ______ years to make robots look like people, and do the same things as us.
| A．hundreds of | B．two hundreds of | C．two hundreds | D． hundreds |