--- Jack, you look tired today. What’s wrong?

--- I was ____ busy ____ I didn’t go to bed until midnight yesterday.

A．too; to

B．so; that

C．enough; to

D．such; that

为保证排放气不论何时出来均能燃烧，火炬筒头上应安装有（）。

A．喷头

B．放气阀

C．点火烧嘴

D．侧板