The officer gave orders that anyone_____ a gun should be reported to the police station.

—You look a bit worried.What has happened? —So I do.You see，the computer I got ________ yesterday doesn’t work again.

As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.

The old man is badly ill and he needs ___________ to hospital at once.

 Mother caught the boy _____ in the corner.