A．take off B．set off C．set up D．take up
单项选择题The drowning boy made a （） attempt to catch the rope thrown to him.
A．dangerous B．graceful C．gentle D．desperate
单项选择题I can （） you that the animals are well cared for in our zoo, so you needn't worry about them.
A．suppose B．assume C．assure D．grant
