It was probably _______ the wrong operation(操作) of the pilot that caused the plane to crash.
Food supplies may __________ towards the end of the trip, so we can't waste any food.
The watch was very good, and he __________20 percent down for it.
I got to the office earlier that day,__________ the 7:30 train.
Would you like to __________ with us to the film tonight?
At school, some students are active __________ some are shy, yet they can be good friends with one another.