You can’t take photographs in here unless you get _______from the administrator .
It worried her a bit ________her hair was turning gray.
— I worked till 4:00 a.m. to prepare a report for my boss.—________ you look very tired.
If possible, you should examine all data fields ______.
—The lights were left on all night long.—Oh. It seems that Tom is ____. Only he stayed in the classroom when I left yesterday evening.
The ________, I think, he drew from his simple experiment is not scientific.