make certain

She would just have to make certain no one saw her.

He took his time, going deep inside each building to make certain.

If necessary, I would have made certain he took you as a student.

She'd find a way to make certain they weren't left out again.

He wanted to make certain they would not come back.

After we land, you make certain we've got the right building.

"How can we make certain our people get lost in the system?"

Making certain was the first thing, before he killed the men who'd taken her.

He should have made certain she would cause him no further problems.

Of course, they had to make certain the job was done.