根据英语翻译以下短语并完成句子。

focus upon ___focus one's attention on sth.__focus one's thoughts on ___focus one's efforts on__The discussion__ three main problems.

  讨论集中在三个主要问题上.

In this scene, the camera __ the actor's face.

   在这个镜头中,摄像机对准演员的脸部.

I quickly__ the children.

   我赶快把照相机对准了孩子们.

 He ____ surfing the Internet day and night.

   他一门心思都集中在了日夜上网上了.