下列各项中加点的词与现代汉语意思相同的一项是（ ）

She sat at her desk, with her eyes__________on the book, ________in its plot[ ]

I find _____ hard to concentrate on my studies withsome people having small talks around me.

Jack fell off theladder yesterday，but he is all right now. —What a lucky dog! He ________himself badly.

In any eme rgency, you should always remain _____.