The school board listened quietly as Jack read the demands that his classmates ______ forward.

-- Who do you think ___ the book here?  --- It may be John. He was sitting here all the morning.

Once new difficulties _________ in your work, it’s always important to use your brains．

To _____ his position in the country, he appointed his close friend Henry as head of the troops. 

With all the food supply ___, the researchers had to put an end to the wildlife protection project and returned home.