微分方程的特解可设为（）

设数列收敛，则（）

设二阶可导函数，则（）

若函数在x=0处连续，则（）

This diploma ( 毕业文凭 ) ________ that you have completed high school.

To succeed in a scientific research project ________.

The more we looked at the picture, ________.

I know it isn ’t important but I can ’t help ________ about it.

Comrade Li ________ be in Beijing because I saw him in town only a few minutes ago.

Wood does not conduct electricity; ________.