一通り読み終えたところで、あんぐり口を開けた。の英語

As his eyes ran over the paper, his jaw fell.

I carelessly allowed the door to stand open.

Tom left his door open.

You spoke too soon.

I awoke to find the house stirring.

Keep your mouth shut and your eyes open.

D-drat! I didn't mean to let that slip..

I found the box empty.

to be in open-mouthed surprise―to gape and stare

I found the door ajar [slightly open].

When the door was opened, the bell rang noisily.

He was in open-mouthed amazement.

Then, finally, she opened her mouth.

talk wildly

The door yielded to a strong push.

Locking all the doors, I went to bed.

Open your mouth a little wider.

I attached a tambour to the drawer.

The door opened automatically.

The door opened by itself.

a slashed sleeve

The door creaked when I opened it slowly

As I opened the door without knocking, she lost her temper.

of a person's mouth, opening wide in surprise

speak [choose] at random

I opened all the windows in the back.

The back door opens onto a narrow lane.

He can not open his mouth without putting his foot in it.

A turn of the knob opened the door.

He turned the key slowly [gave the key a slow turn] and the door swung open.