can not的缩写形式是：____.

“积一勺以成江河，累微尘以成俊极”，这句话告诉我们培养坚强的意志要（    ）

为了宣传维新思想，维新派在北京创办的报刊是（    ）

下列概念除哪项外，均可用如图来表示（　　）

    Tom always can't sleep well at night. But he was never late for work. He went to see his doctor on Sunday afternoon. He took the subway to get there. He met his boss on the subway and they talked for a while.

    Tom got some sleeping pills from the doctor. That night Tom took the pills. He had a nice sleep. He went to work happily on foot in the morning. Getting into the office, he said to his boss “I had a nice sleep and got up happily this morning.” “That's fine,” shouted the boss, “but where were you on Monday?”