the size of the universe, some researchers believe that there is life beyond our planet.

Haven’t you seen the speed limit sign? Please drive _____ —Sorry, but I have to [ ]

下列各句中，没有语病的一项是（ ）

Is the doctor your sonHas he graduated from university—Yes，he in Nanjing Medical University for 5 years.

Mr Brown will fivedays to have a good rest.