The sun heats the earth, ___________ is very important to living things.
A．that B．what C．which D．where
I will visit you if Father ______ me.
A．let B．lets C．is letting D．will let
The policeman warned the drive ________ so carelessly.
A．never to drive B．to never drive C．to not drive D．doesn’t drive
— Why does she always ask you for help?
— There is no one else _______, is there?
A．who to turn to B．for her to turn
C．for whom to turn D．she can turn to
In order to be _______ for Christmas, all these gifts must be mailed immediately.
A．in time B．at one time C．at a time D．in no time
Two people were killed in the serious car _______ the other day.
A．strike B．break C．crash D．incident
