在0，8，-15，10，3.15，-3.7，0.43中，______是自然数，______是小数，______是整数，______是正数，______是负数．

Not having worked out the program, ________ leave the office. 

A．so he was forbidden to

B．and he didn’t want to

C．his little son couldn’t make him

D．be couldn’t free himself to