During the period of recent terrorist activities, people _____ not to touch and unattended bag.
You ____be tired—you have worked only for ten minutes.
—Tom lost his job last week. —___he is wandering in the street these days.
The witnesses(证人) of the accident said that the lorry _______ very fast at the crossroads when the accident happened.
._____ nothing is doing ill.
Our monitor talks about Mars as if he ______ a scientist.