用下列词语造句。
①出其不意
②竭力
①今日是年晚，此老必定在家，须乘此时调兵围住，出其不意，方无走失。②我们一定竭力完成任务。
138减去42的差是____?73与27的和是____?将所得的差与和相乘，积是____?
the money the government offered, the pupils in the poor area could go back to school again.
