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
It is said that the temperature is unusual mainly _______ global warming caused by human activities.
A．in spite of B．by means of C．in case of D．on account of
The transformation of our city will make _______ for people here to have a comfortable environment.
A．it possible B．no possibility C．impossible D．there was possibility
Mary _______ her mother with the housework, but she didn’t.
A．must have helped B．ought to have helped
C．must help D．should help
The local government announced that only when the fire was under control ________ to return to their homes.
A．the residents would be allowed B．had the residents been allowed
C．would the residents be allowed D．the residents had been allowed
