Go to bed right away．Don’t forget you need to get upas early as you can ______ the early train．

When asked to explain _____ he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.

Visitors ________ take an animal or any other item prohibited by the Expo Bureau to the Expo Park.

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.[ ]

al evidence began to__________, suggesting that thenew drugs had a wider range of useful activities than had been predicted fromexperiments in animals