Bob often _____ his homework after dinner.
A：do
B：does
C：doing
D：to do
心血管科的医生把病人的血压变化情况制成统计图，应选择 ____统计图。
下列事件发生的先后顺序是( )①强渡乌江 ②四渡赤水 ③巧渡金沙江 ④飞夺泸定桥
There tall buildings in my school．
