读“中国地理区域图”,在甲、乙、丙、丁四区中,人口密度最小的地区是( )
A:甲地区
B:乙地区
C:丙地区
D:丁地区
With nothing ________ to burn, the fire became weak and finally died out.
A set of __________ on the table.
大家都夸你跳舞跳得很好,这时学校有个歌舞比赛,你会 ( )。